Re: how do you suppose targetViewControllerForAction:sender: works?

[glenn andreas]

(typed in mail)

if ([[vc class] instanceMethodForSelector: selector] != [[vc superclass] 
instanceMethodForSelector: selector]) {
// vc's class implements an instance method that is different from it's 
superclass - i.e., it has overridden it
}

On Oct 9, 2014, at 11:56 AM, Matt Neuburg  wrote:

> From the WWDC 2014 video 216: "targetViewControllerForAction works by looking 
> at the View Controller and seeing if it's _overwritten_ the action method 
> that you've passed in."
> 
> From Kyle Sluder's blog: "-targetViewControllerForAction:sender: ... will 
> then determine whether the instance’s method for that selector is an override 
> of a UIViewController implementation for the same selector."
> 
> Those descriptions are correct. But then how do you suppose it does this? 
> There's an introspective voodoo happening here that I've never seen before. 
> `respondsToSelector:` obviously doesn't cut it: it would return YES if this 
> class merely _inherits_ the ability to respond to this selector. How would 
> you find out the answer to the question, "does this UIViewController subclass 
> respond to this selector _differently_ from UIViewController?"
> 
> Thx - m.
> 
> --
> matt neuburg, phd = http://www.apeth.net/matt/
> pantes anthropoi tou eidenai oregontai phusei
> Programming iOS 7! http://shop.oreilly.com/product/0636920031017.do
> iOS 7 Fundamentals! http://shop.oreilly.com/product/0636920032465.do
> RubyFrontier! http://www.apeth.com/RubyFrontierDocs/default.html
> 
> 
> 
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correlate all its contents - HPL


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Re: Send POST data to browser

[glenn andreas]

On Sep 17, 2009, at 12:14 PM, Jens Alfke wrote:



On Sep 17, 2009, at 3:26 AM, Bartosz Białecki wrote:


I can launch browser with url using this code:
NSURL *url = [NSURL URLWithString: @"https://www.example.com/index.php 
"];

[[UIApplication sharedApplication] openURL: url];
but I don't know how to send post data.


You can't do it — the browser will only do a GET on URLs it's told  
to open.



I tried also another solution: send post data from my application to
website and then get a response, but then I don't know how to open
returned page in browser.


A successful POST will return one of two different things —
(1) A redirect to another page. This is a typical HTTP redirect,  
with a status like 302, 303 or 307 and a Location: header that  
specifies where to go. In this case you just read the URL from the  
Location: header and pass that to the browser.
(2) An actual page body to display, i.e. a 200 status and a bunch of  
HTML. This isn't so easy to handle, since you can't give the HTML  
itself to the browser. The only way you could display it is to open  
your own UIWebView (in which case it would probably be easier to  
just open it before the request and use it to send the POST...)


If you own the website, then you can make sure that its login page  
does (1), which is the more correct thing to do anyway.



There's no guarantee that (1) will work, since often this case also  
includes setting some sort of session cookie (which goes away when the  
app quits, which, of course, it does when Safari is launched). Even if  
it sets a persistent cookie, I don't believe that cookies are shared  
at all between your sand-boxed app and Mobile Safari.


(2) is probably the safest bet unless it's for your own website and  
you can convert the CGI to support GET as well as POST.




Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
Mad, Bad, and Dangerous to Know

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Re: UIGraphicsBeginImageContext thread safety

[glenn andreas]

On Oct 1, 2009, at 6:41 AM, Andrew wrote:


Hi All,

So clearly the UIGraphicsBeginImageContext() set of calls are not  
thread safe, I was attempting to use them in an NSOperation and they  
are causing a crash, further research has shown me that I need to  
drop down into the CG calls to do what I want to do.



.and presumably I could have been forewarned if I had looked at  
the 'UI' at the front of the function, and had read that as a Sign.



I am, however, very interested...for my own curiosity...in why they  
are not?  my mental image of that call had it simply wrapping the  
CGBitmapContextCreate() set of calls, and they are thread safe.



what is it doing that renders it not thread safe, does anyone know?



At the very least, it needs to call UIGraphicsPushContext to set the  
current "ui graphics context", which is documented as needing to be  
done on the main thread (which implies that there is a single, global  
"ui graphics context" variable use by all of UIKit to indicate where  
all UIKit based drawing should go).





Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
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Re: Opening a NSSavePanel as a Sheet, and blocking like in [panel runModal]

[glenn andreas]

On Oct 14, 2009, at 8:02 AM, Motti Shneor wrote:


Hello.

I'm in a strange situation, where I am implementing a plugin component
that runs within a host application which I don't have access to.

Within this context, The host sometimes calls my plug-in to open an
NSSavePanel (or NSOpenPanel). The host expects that I'm synchronous
--- i.e. I only return when the NSSavePanel is dismissed, and there's
a result.

However, The host also provides me with its own Window, and I need to
open my NSSavePanel as a Sheet-window over the host's window.




You really can't - sheets are document modal (by design), not  
application modal - if a window has a sheet displayed, the user needs  
to still be able to switch to other documents within the application  
and do stuff.  The description of the plugin model does not sound like  
it supports it, so you'd use an application modal document, not a sheet.


So you can probably make it look right, but you won't be able to make  
it work right (from the point of view of the user).



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
Mad, Bad, and Dangerous to Know

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Re: Programming Style: Method Definition with or without a semicolon.

[glenn andreas]

On Oct 16, 2009, at 2:55 AM, Bill Bumgarner wrote:



On Oct 16, 2009, at 12:17 AM, Sander Stoks wrote:

If it's a feature, then it's definitely a new one since the  
original specification of Objective-C.  It turned out to be  
surprisingly hard to find that specification, but I found a grammar  
description here:http://www.cilinder.be/docs/next/NeXTStep/3.3/nd/ 
Concepts/ObjectiveC/B_Grammar/Grammar.htmld/index.html


There it says:

instance-method-definition:
  [ method-type ]  method-selector  [ declaration- 
list ]  compound-statement


method-selector:
unary-selector
keyword-selector  [ ,  ... ]
keyword-selector  [ ,  parameter-type-list ]

The declaration-list and compound-statement are not specified  
further and are taken from the C spec.  In other words: There's no  
semicolon.


On the other hand, the grammar spec has been removed from Apple's  
documentation, and I suppose the official line is now "Objective-C  
is whatever we ship with Xcode."


I haven't booted my NS 0.8 cube in about a decade, but I'm pretty  
sure the semi-colon was always required in the header file and  
always allowed in the @implementation.


'Twas many a moon ago, but, I do distinctly remember triple-clicking  
method declarations from headers (with semis) to copy-paste into my  
implementation without deleting the semi.   It always stuck with me  
as an über-convenience.


b.bum



You can (or at least could) copy the entire @interface section from  
the .h, paste into the .m and change @interface to @implementation and  
it would compile.


So yes, this is legal:

@implementation MyObject : NSObject {
id myIvar;
}
- (void) doSomething;
@end

Not that I'd recommend or even admit to doing this (I have no idea  
what happens if the @implementation class details are different from  
the @interface ones, and, again, not that I'd ever admit to having  
done this, it is easy to accidentally write your implementation in  
your .h file and leave the pasted @interface in your .m).



Glenn Andreas  gandr...@gandreas.com
The most merciful thing in the world ... is the inability of the human  
mind to correlate all its contents - HPL


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Re: Can I make custom pasteboard type for an object reference?

[glenn andreas]

On Oct 16, 2009, at 3:51 PM, Sean McBride wrote:


On 10/15/09 6:34 AM, Timothy Stafford Larkin said:


I messed around with this problem for some time, before I gave up
trying to be clever and cast the pointer as an unsigned long.

		NSNumber *p = [NSNumber numberWithUnsignedLong:(unsigned long) 
object];


The number can be added to a pasteboard. Or if dragging more than one
object, NSNumbers can be added to an NSArray, and the array written  
to

the pasteboard.


That seems quite dangerous, especially in a GC app.  Creating such an
NSNumber will not keep a strong reference to "object", and so it risks
getting prematurely collected.  If you do do this, better CFRetain the
object first.



And that isn't enough to help if you use some sort of pasteboard/ 
scrapbook manager to store the dragging pasteboard, quit the app, and  
later relaunch it and try to drag the archived pasteboard from you  
pasteboard manager app.




Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
quadrium2 | build, mutate, evolve, animate  | images, textures,  
fractals, art



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Re: Opening a NSSavePanel as a Sheet, and blocking like in [panel runModal]

[glenn andreas]

On Oct 22, 2009, at 8:44 AM, Motti Shneor wrote:


Thanks again.

Regarding the Carbon Window problem, the FrontWindow() call was just  
an illustration. The WindowRef I'm supplying is of a visible  
(usually active and front) Document window. The problems are not  
even consistent, and will randomly occur. The desired behavior,  
though, will very rarely occur. (I'd say one in a hundred times).


In short --- Are there any specific implications to opening a cocoa  
sheet over a carbon (document) window? Is there any specific setup I  
need to know about? What are the limitations of Cocoa NSWindow  
wrappers around Carbon windows?


The problem is, my Plugin is written using cocoa, but runs within a  
Carbon application. I need to attach my NSOpen/NSSave panels onto a  
given application window, which is, of course, a Carbon window. I  
get this bogus behavior and even worse, both running with my Host  
application, and with simplistic test programs like the one below.




There's one fundamental problem - sheets are designed to be document  
modal, not application modal, which requires support from the  
underlying application in order to work correctly.


So a sheet is not support to block the app like runModal does, but to  
work in conjunction with document architecture.


You're basically fighting the frameworks, and the frameworks always  
win...


Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
Mad, Bad, and Dangerous to Know

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Re: Displaying a view modally

[glenn andreas]

On Oct 21, 2009, at 7:54 PM, Saurabh Sharan wrote:


Check out SFHudView by Buzz Andersen (
http://github.com/ldandersen/scifihifi-iphone/blob/master/UI/SFHFHUDView.h 
)

Saurabh



That code runs contrary to the documentation ("iPhone Application  
Programming Guide", "Windows and Views"):


Although iPhone OS supports layering windows on top of each other,  
your application should never create more than one window. The  
system itself uses additional windows to display the system status  
bar, important alerts, and other types of messages on top of your  
application’s windows. If you want to display alerts on top of your  
content, use the alert views provided by UIKit rather than creating  
additional windows.






Ignoring this will result in inconsistent behavior between different  
OS releases.


You're better off making a simple blocking view that "consumes" all  
the touch events (i.e., implements everything, but does nothing), give  
it a translucent gray background and make it the size of the window,  
and add it as a subview of the window, on top of everything else.


Then add your modal content view on top of that blocking view.



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
quadrium2 | build, mutate, evolve, animate  | images, textures,  
fractals, art



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Re: UITextField in UITableView covered by keyboard

[glenn andreas]

On Oct 24, 2009, at 4:31 PM, Henry McGilton (Boulevardier) wrote:



On Oct 23, 2009, at 10:29 AM, Bob Barnes wrote:


Hi all,

 I posted this a yesterday, but it never appeared on the list and  
it's not showing up in the web archive so I thought I'd retry.


I have a UITableView that contains some cells with UITextField's  
embedded in them. When I touch the UITextField to begin editing the  
keyboard pops up and obscures the the text field. I've been looking  
at the UICatalog sample, which has  a nearly identical setup and  
the UITextField scrolls up to make itself visible, but I've been  
unable to determine what it's doing to cause that. I've read  
suggestions on scrolling the UITexField rect, resizing the  
UITableView, etc., but UICatalog doesn't do any of that, yet still  
works. What am I missing?



You may also have to consider the scenario where the Table View Cell  
that contains the UITextField
is so close to the end of the Table View that it can not be scrolled  
up out of the way.  In the case, you
have to temporarily move the entire Table View upwards by adjusting  
its frame origin . . .



Not at all - just set the content inset & scroll bar inset  
appropriately (which is what UITableViewController does).  Way more  
easy than messing with frames (not to mention works correct - moving  
the frame will result in the other end of the scrolling range not  
being reachable).




Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
Mad, Bad, and Dangerous to Know

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Re: first responder being clobbered

[glenn andreas]

On Oct 26, 2009, at 10:55 PM, Michael Link wrote:

I have a custom UITableViewController that uses a custom cell that  
displays a text field. I have this method added to the table view  
controller to set the text field as first responder


- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

	MLPropertyEditingTableViewCell* __cell =  
(MLPropertyEditingTableViewCell*)[self.tableView  
cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];


   [__cell.textField becomeFirstResponder];
}



What if you do it in "viewDidAppear" instead of "viewWillAppear"?

Since the view technically isn't on screen yet (only that it "will  
be"), setting a first responder shouldn't be done then.



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
JSXObjC | the easy way to unite JavaScript and Objective C




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Re: Transparency Help

[glenn andreas]

On Nov 23, 2009, at 10:12 AM, R T wrote:

> I have a litho image (black & white pixels only) and I want to make all the 
> white pixels transparent. I am using Quartz 2d to display the image and I 
> have a Quartz composition containing a single .cikernel...

> Any ideas?
> 

Why not just draw it using one of the transfer modes like kCGBlendModeDarken or 
kCGBlendModeMultiply rather than generate multiple images, tweaking all their 
bits, custom kernels, etc...

Both modes should cause black pixels to be drawn as black, and white pixels to 
not change the image at all...


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Core Data: Specifying latest .mom resource. Was: NSMigratePersistentStoresAutomaticallyOption...

[glenn andreas]

On Nov 24, 2009, at 12:55 AM, Jerry Krinock wrote:

> Sorry, I'm back with this problem.  Although the code I posted worked 
> perfectly in a Debug build, when I tested a Release build, the invocation of 
> -mergedModelFromBundles: raised this exception :
> 
>   Can't merge models with two different entities named 'Ixternalizer_entity'

Did you do a clean all before your build?

If a file is removed/renamed in Xcode, the old file will continue to exist in 
the build until you do a clean - adding a new version results in leaving the 
old version there (rather than just replacing it with the appropriate migration 
information).


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Wondering about that iPad page curling

[glenn andreas]

That relies on undocumented private APIs, which is both off topic for this 
list, and, more importantly, grounds for getting your app rejected when 
submitted to the AppStore.


On Apr 6, 2010, at 2:00 PM, Gleb Dolgich wrote:

> http://blog.steventroughtonsmith.com/2010/02/apples-ibooks-dynamic-page-curl.html
> 
> -- 
> Gleb Dolgich
> http://pixelespressoapps.com
> 
> On 6 Apr 2010, at 16:56, Laurent Daudelin wrote:
> 
>> So, no other response from the regular crowd of "resident experts" on how 
>> Apple engineers did this?

Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: "Toll free" bridge from NSAttributedString * to CFAttributedStringRef

[glenn andreas]

On Apr 8, 2010, at 7:02 AM, vincent habchi wrote:

> Hi there,
> 
> I've been fiddling with NSAttributedString lately, and the way to display 
> them through Core Text. In the docs, I've read that NSAttributedString and 
> CFAttributedStringRef were supposed to be "toll free" bridged; I assumed that 
> meant that one could be used in lieu of the other with (or maybe even 
> without) a simple cast.
> 
> But I found this is not true. Specifically, I was getting strange errors like 
> "CFSet[Stroke|Fill]ColorFromColor : invalid context 0x0" each time I printed 
> my NSAttributedString by CTLineDraw(), although I had a perfectly valid 
> context. The glyph were drawn, but always in black, while I was attempting to 
> get another color via the NSForegroundColorAttributeName. At the end, I had 
> to replace the pair (NSColor, NSForeground…) by a (CGColorRef, 
> kCTForeground…), and now it works.
> 
> Is that supposed to be a "normal" behavior, did I misunderstand the meaning 
> of "toll free", or is it a bug?

NSAttributedString and CFAttributedStringRef "the data structure" are toll free 
bridged, but that just means that the objects themselves can be interchanged.  
The problem is that, like an NSDictionary, they can store arbitrary objects 
that may not be toll free bridged - in this case, NSColor and CGColorRef are 
not interchangeable, nor are the keys NSForegroundColor and 
kCTForegroundColorAttributeName documented as the same.

So CTLineDraw expects to have the color specified as a CGColorRef in 
kCTForegroundColorAttributeName, while drawString: expects to have the color 
specified as an NSColor in NSForegroundColor.



Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: [NSMutableArray array]

[glenn andreas]

On Apr 8, 2010, at 12:29 PM, Bill Bumgarner wrote:

> 
> On Apr 8, 2010, at 10:21 AM, Patrick M. Rutkowski wrote:
> 
>> Agreed, but there's always the danger the +array method, which might
>> actually be implemented in NSArray.m, will not properly initialize the
>> more specific NSMutableArray object.
>> 
>> Of course, in this specific case that's the case, but it might be the
>> case with other class hierarchies.
>> 
>> But, nonetheless I'm troubled that nobody in this thread has
>> acknowledged that yet :-o
> 
> Because, in practice, that doesn't generally happen. 
> 
> Across the system supplied frameworks, classes generally have designated 
> initializers and those initializers are inherited properly.  The convenience 
> creation methods -- factory methods, if you will -- are dead simple stupid, 
> generally doing the equivalent of '[[[self alloc] init*] autorelease]' where 
> the init part calls the designated initializer.

There is a problem with "things that look like convenience creation methods but 
aren't" - most notably +[NSParagraphStyle defaultParagraphStyle].  You might 
expect:

NSMutableParagraphStyle *ps = [NSMutableParagraphStyle defaultParagraphStyle];
[ps setAlignment: NSCenterTextAlignement];

to work.  It doesn't (since ps is actually an immutable NSParagraphStyle).

The major clue that is isn't a convenience creation method being found in the 
declaration:

- (NSParagraphStyle *) defaultParagraphStyle;

instead of:

- (id) defaultParagraphStyle;


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: NSCalendar date calculation anomaly

[glenn andreas]

On Apr 27, 2010, at 10:45 PM, Scott Ribe wrote:

> I have an int representing the number of days since 1/1/2001, and wish to get 
> an NSDate representing that date in the system's local time zone:
> 
> NSDateComponents *dc = [[[NSDateComponents alloc] init] autorelease];
> [dc setDay: numdays];
> NSDate * cd = [[NSCalendar currentCalendar] dateByAddingComponents: dc 
> toDate: [NSDate dateWithString: @"2001-01-01"] options: 0];
> NSLog( @"date 1: %@", [cd description] );
> [dc setDay: 0];
> [dc setSecond: -[[NSTimeZone systemTimeZone] secondsFromGMTForDate: cd]];
> cd = [[NSCalendar currentCalendar] dateByAddingComponents: dc toDate: cd 
> options: 0];
> NSLog( @"date 2: %@", [cd description] );
> 
> If for example numdays is the number of days from 1/1/2001 to 5/4/2010, then 
> the output is this:
> 
> 2010-04-27 21:33:55.803 PedCard[95387:a0f] date 1: 2010-05-03 17:00:00 -0600
> 2010-04-27 21:33:55.804 PedCard[95387:a0f] date 2: 2010-05-03 23:00:00 -0600
> 
> And, BTW, my current time zone is MDT, so -0600 is not correct, it should be 
> -0700. So what's going on? I would expect those dates to be:
> 
> 2010-05-03 17:00:00 -0700
> 2010-05-04 00:00:00 -0700
> 


MDT is -0600 so this is correct - MST is -0700. (stupid "spring forward, fall 
back" clock resetting...)

I find that dealing with dates and time zones it's best to consider NSDate to 
be just a scalar value, with a separate time zone (and optional calendar) being 
the "unit".  It's up to the formatter used to display that (scalar) date in the 
desired unit.


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: self = [super init], nil?

[glenn andreas]

On May 8, 2010, at 12:35 PM, James Bucanek wrote:

> Kyle Sluder <mailto:kyle.slu...@gmail.com> wrote (Saturday, May 8, 2010 8:48 
> AM -0700):
> 
>> It might produce less code, it might not. If you're operating at the ObjC
>> level of abstraction and worrying about the codegen of self=[super init], 
>> your
>> priorities are out of order.
> 
> I'm a coding genius. My priorities are never out of order. ;)
> 
> There are completely legitimate reasons to want to optimize one's code, and 
> examining the overhead of -init seems perfectly rational to me. This seemed 
> to be the brunt of the original poster's question.
> 
> I was simply pointing out the fallacy of believing that if ((self=[super 
> init])!=nil) is inherently less efficient (e.g. produces more code) than if 
> ([super init]!=nil).


Those two produce different results, so comparing their efficiencies is 
pointless.  To make matters worse, "if ([super init] != nil)" is also wrong, so 
it doesn't matter if it is more efficient.




Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Regarding MVC design pattern

[glenn andreas]

On May 20, 2010, at 9:47 AM, Thomas Davie wrote:

> 
> On 20 May 2010, at 15:45, Barry Skidmore wrote:
> 
>> If you need to have it set you should create an initWithOptionName: and call 
>> that from your standard init, or return an error stating a missing value is 
>> needed.
>> 
>> Your init should always call down tithe most specific init.
>> 
>> Specific examples of this are available as best practice in several cocoa 
>> and design pattern books.
> 
> I think you've misunderstood what I was asking.
> 
> If I use a setter (in the most specific init), then I don't need to recode 
> (even the most specific init) if I change how the property is implemented.
> 
> If I don't use the setter, I do.
> 
> What I was asking was why you would want to avoid using setters in the init 
> method... Is there some safety issue I've missed?


The problem is that if you later subclass that object and override the setter 
in the subclass, this means that code in the subclass (the setter) is run 
before the subclasses init has run.  This may be a problem if the subclass 
setter assumes that various other values in the subclass are properly 
initialized.  So:

@interface ClassA : NSObject {
AnObject *ivar;
}
@property (nonatomic, retain) AnObject *ivar;
@end

// A subclass of ClassA that add some sort of logging/transcript
@interface ClassB : ClassA
@property (nonatomic, readonly) id uniqueId;
@end

@implementation ClassA
@synthesize ivar;
- (id) init
{
self = [super init];
if (self) {
self.ivar = some value; // (1)
}
return self;
}
@end

@interface ClassB
- (id) init
{
self = [super init]; // (2)
if (self) {
self.uniqueId = [UniqueId uniqueId]; // (4) in keeping with the 
bad style, we call our setter here as well
}
return self;
}
- (void) setIvar: (AnObject *) obj
{
[[Transcript currentTranscript] setProperty: @"ivar" ofObject: 
self.uniqueId toValue: obj ]; // (3)
[super setIvar: obj];
}
@end

So when you do:

[[ClassA alloc] init];

everything is fine, but

[[ClassB alloc] init];

when it gets to (2), calls the super init and at (1) ends up calling code at 
(3).  But self.uniqueId will be nil (since the code at (4) hasn't been reached 
yet), and the -[Transcript setProperty:ofObject:toValue:] may not be able to 
deal with nil as the object parameter.




Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: CFAttributedString and NSDATA

[glenn andreas]

On Jun 3, 2010, at 12:08 PM, Chaitanya Pandit wrote:

> 
> Yeah NSAttributedString is available in 3.2, but what would have been more 
> helpful would be having the AppKit additions of NSAttributedStrings.
> The CFAttributedString and the NSAtttibutedString in 3.2 looks kinda half 
> hearted effort without the AppKitAdditions
> 

AppKitAdditions require AppKit - they are specifically tied to AppKit graphics 
models and data structures, none of which exist on the iPhone.  Nor, for that 
matter do any of the sophisticated AppKit based text rendering mechanisms that 
use the various things in AppKitAdditions.

If you have specific things in mind that you need, you should file an 
enhancement request at bugreporter.apple.com.


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: How to specify the superview in the Interface Builder?

[glenn andreas]

On Jun 4, 2010, at 11:53 AM, ico wrote:

> Hi all,
> 
> I have created a custom view in the Interface Builder, how can I specify the
> superview for this custom view? For example,
> I want to make its superview be UIWindow rather than another custom view.

Then drag a UIWindow from the library and put your view inside that.

Note, however, that you probably don't want to be doing that in general (except 
for the main nib).  From the UIWindow documentation:

> Although iPhone OS supports layering windows on top of each other, your 
> application should never create more than one window. The system itself uses 
> additional windows to display the system status bar, important alerts, and 
> other types of messages on top of your application’s windows. If you want to 
> display alerts on top of your content, use the alert views provided by UIKit 
> rather than creating additional windows.


So if your design requires a view living in anything other than the main 
window, you should probably redesign it (or be prepared for lots of debugging 
and testing, since the way multiple UIWindows work varies between OS release, 
and possibility of rejection from the AppStore when you submit it)


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: [iPhone] Preprocessing events sent to UITableView

[glenn andreas]

 
On Saturday, June 05, 2010, at 05:51PM, "WT"  wrote:
>I need to hijack the set of touch events sent to a UITableView instance prior 
>to allowing the table to process those events.
>
>I have a custom UIView, of which the table view is a subview, and I override 
>-hitTest:withEvent: there (in the custom view) to return self, thereby 
>preventing the table from receiving those touches.
>
>Since my custom view does not implement any of the four event-handling methods 
>(-touchesBegan:withEvent:, etc), the view controller managing my custom view 
>gets the touches, through the regular traversal of the responder chain.
>
>There, in the view controller event-handling methods, I determine whether or 
>not I need to consume the events. If not, I need to send them back to the 
>table view for it to do its normal event handling (for instance, scrolling).
>
>All of the above works fine, except...


Probably not as "fine" as you expect - UIViews are not designed to support 
UIEvents forwarded to them except under very controlled conditions.  From 
:

"The classes of the UIKit framework are not designed to receive touches that 
are not bound to them; in programmatic terms, this means that the view property 
of the UITouch object must hold a reference to the framework object in order 
for the touch to be handled. If you want to conditionally forward touches to 
other responders in your application, all of these responders should be 
instances of your own subclasses of UIView."

That document contains a number of suggestions on how to approach those sort of 
design issues...

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Re: Custom views in navigationbar (iOS 3.2)

[glenn andreas]

On Jun 23, 2010, at 5:51 AM, Christian Ziegler wrote:

> Hi guys,
> 
> I'm having a hard time with the navigation bar. What I'm trying to do is 
> adding a custom breadcrumbs navigation to the bar. I coded two classes, a 
> subclass of UIButton for the breadcrumbs segments and a sublcass of UIView 
> for the whole bar. The bar has a home segment which represents the 
> rootViewController of the navigationController and you can add additional 
> segments when you push new viewControllers on to the navigationController's 
> stack. 

You do realize that the HIG explicitly says to not do that?   From 
<http://developer.apple.com/iphone/library/documentation/userexperience/conceptual/mobilehig/SpecialViews/SpecialViews.html#//apple_ref/doc/uid/TP40006556-CH10-SW21>

Using a multi-segment back button causes several problems:

• The extended width of a multi-segment back button does not leave room 
for the title of the current screen.
• There is no way to indicate the selected state of an individual 
segment.
• The more segments there are, the smaller the hit region for each one, 
which makes it difficult for users to tap a specific one.
• Choosing which levels to display as users navigate deeper in the 
hierarchy is problematic.
If you think users might get lost without a multi-segment back button that 
displays a type of breadcrumb path, it probably means that users must go too 
deeply into the information hierarchy to find what they need. To address this, 
you should flatten your information hierarchy.




So once you spend hours and hours coding and getting this working perfectly, it 
will probably end up being rejected by the AppStore approval process.


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: setValue:forKey: and invocation forwarding

[glenn andreas]

On Jul 13, 2010, at 7:53 AM, Graham Cox wrote:

> It appears that calling -setValue:forKey: on an object bypasses or ignores 
> any invocation forwarding it has set up, unless I'm missing some obvious 
> error.
> 
> I have an object that acts as a wrapper for another object, and so that the 
> wrapper can, under some circumstances, act as the thing it is wrapping, it 
> implements invocation forwarding using the 'classic' approach of overriding 
> -respondsToSelector:, -methodSignatureForSelector: and -forwardInvocation: 
> but when I call -setValue:forKey: on the wrapper (where key is implemented by 
> the thing wrapped), it throws the 'not key-value coding compliant for key' 
> exception. The stack trace appears to show that this failure occurs before it 
> has even attempted to follow the forwarded path. However if I simply call the 
> wrapped property setter directly, the forwarding works. As this needs to work 
> on 10.5, I can't use the 10.6 solution of -forwardingTargetForSelector: (not 
> that I've tested it to see if it exhibits the same issue or not). 
> 
> Is this the expected behaviour?

Well, the documentation (KVC Programming Guide, Accessor Search Implementation 
Details)  says that the pattern for setValue:forKey:

• The receiver’s class is searched for an accessor method whose name 
matches the pattern -set:.

So the question is "what does 'searched' mean"?  Since that document talks 
about method names that match certain patterns, I'm guessing that it walks the 
method table (instead of calling respondsToSelector:).

I'd just override valueForKey: and setValue:forKey: in your class to handle 
forwarding those to your wrapped object.


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: UITableViewController, with table view not the root of its nib?

[glenn andreas]

On Aug 3, 2011, at 3:49 PM, Jens Alfke wrote:

> I’ve got an iOS screen that incorporates a UITableView. This screen is run by 
> a UIViewController subclass. I’d like to subclass UITableViewController 
> instead, to get more table behaviors for free. The problem I’m running into 
> is that the table view is not the root view of my nib. (There’s a text field 
> above the table that’s a sibling of it.)
> 
> As far as I can tell, UITableViewController only works when the table is the 
> root of the nib. It does have a separate ‘tableView’ property, but this isn’t 
> an IBOutlet so there’s no way to wire it up to the table view in the nib. 
> Instead, the class assumes that the ‘view’ outlet — which must point to the 
> nib’s root view — is the table view, and raises an assertion failure 
> otherwise.
> 
> I’m trying to figure out a way around this, but every workaround I think of 
> makes the project more complicated, canceling out the benefit of switching to 
> UITableViewController. Is there a clean way of doing it that I’m missing?
> 

UITableViewController, like all UIViewControllers, expect their view to be the 
"root" of the window (where "root" is defined as either being the only subview 
of the UIWindow) or the current/topmost view controller of a 
UINavigationController, UITabViewController, UISplitViewController, etc...

UIViewControllers are not designed to have their views inside other arbitrary 
views (except for the previously mentioned UINavigationController, etc...).  
For more detail, there was a WWDC session on "Implementing UIViewController 
Containment".

To add a text field (or other arbitrary views) "along side" the table view, you 
have a couple of choices:
- Put it in the table view header view.  Disadvantage is that it can get 
scrolled off screen
- Put the view in a row in its own section.  Similar to previous
- Put it in the first section's header view.  Only works well if you have a 
single section, are in non-grouped mode
- Put the view into the navigation controller's title view.  Limits the height 
of your view, and assumes you've got a nav controller, and aren't already using 
the title

You can also play games where you add the view to the tableview itself, and, 
since the tableview is a scrollview, adjust the content to allow that item to 
show, and then, upon scrolling, make sure the view is on the top of the screen 
(both in Y and Z coordinates, since the table view may have made a new cell 
that ends up layered covering your view)


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Unnecessary Boolean Warning

[glenn andreas]

On Aug 3, 2011, at 8:27 PM, Graham Cox wrote:

> 
> On 04/08/2011, at 11:19 AM, Greg Parker wrote:
> 
>>> This is a classic question for coding job interviews.
>> 
>> Incorrect.
> 
> 
> Ah well, I guess I didn't get the job :)
> 
> In my defence, I saw this in a job interview but it was prior to 1999. Maybe 
> C99 tightened up on something that was previously vague.
> 
> --G.
> 

My copy of K&R  © 1978 says:

"More interesting are the logical connectives && and ||.  Expressions connected 
by && or || are evaluated left to right, and evaluation stops as soon as the 
truth or falsehood of the result is known.  These properties are critical to 
writing programs that work."

(p 38)

and later in Appendix A: C Reference Manual:

"Unlike &, && guarantees left-to-right evaluations; moreover the second operand 
is not evaluated if the first operand is 0"

(p190, section 7.11 Logical AND operator)

"Unlike |, || guarantees left-to-right evaluations; moreover the second operand 
is not evaluated if the first operand is non-zero"

(p191, section 7.12 Logical OR operator)


Nothing vague there.  More likely the somebody that interviewed you didn't have 
it correct in the first place, scarring you for life...


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: CGContextShowTextAtPoint doesn't show text

[glenn andreas]

On Aug 9, 2011, at 9:48 AM, Gabriel Zachmann wrote:

> Thanks a lot for your response ...
> 
>> I've found the Core Graphics text handling methods to be gnarly and awkward 
>> the few times I've attempted to use them, and always ended up going some 
>> other route to render text.
> 
> Could you please point me to a few of them?
> 
>> 
>> In your case, the choice seems simple - just use CATextLayer. Why not?
> 
> Can CATextLayer render text with a shadow?
> Like this:
>  CGContextSetShadowWithColor( ctxt, CGSizeMake(0,0), 10, blue );
> 
> I really need the shadow to be able to discern it from a background layer, 
> the color of which is unknown and changes fairly often.


CATextLayer is a subclass of CALayer, which has a wide variety of shadowing 
options:

/** Shadow properties. **/

/* The color of the shadow. Defaults to opaque black. Colors created
 * from patterns are currently NOT supported. Animatable. */

@property CGColorRef shadowColor;

/* The opacity of the shadow. Defaults to 0. Specifying a value outside the
 * [0,1] range will give undefined results. Animatable. */

@property float shadowOpacity;

/* The shadow offset. Defaults to (0, -3). Animatable. */

@property CGSize shadowOffset;

/* The blur radius used to create the shadow. Defaults to 3. Animatable. */

@property CGFloat shadowRadius;

/* When non-null this path defines the outline used to construct the
 * layer's shadow instead of using the layer's composited alpha
 * channel. The path is rendered using the non-zero winding rule.
 * Specifying the path explicitly using this property will usually
 * improve rendering performance, as will sharing the same path
 * reference across multiple layers. Defaults to null. Animatable. */

@property CGPathRef shadowPath;



So not only does it have a shadow that you can change, you can even animate the 
shadow.

Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: +[UINib nibWithNibName:bundle:] and ~iPhone

[glenn andreas]

More specifically, from the documentation:

To associate a resource file with a particular device, you add a custom 
modifier string to its filename. The inclusion of this modifier string yields 
filenames with the following format:

.

The  string represents the original name of the resource file. It 
also represents the name you use when accessing the file from your code. 
Similarly, the  string is the standard filename extension 
used to identify the type of the file. The  string is a case-sensitive 
string that can be one of the following values:

• ~ipad - The resource should be loaded on iPad devices only.
• ~iphone - The resource should be loaded on iPhone or iPod touch 
devices only.



I.e, it needs to be UserLeagueCell~iphone.xib, not UserLeagueCell~iPhone.xib.  
On the simulator, OS X, not being case sensitive, will load find 
UserLeagueCell~iPhone.xib but on the device, being case sensitive, it will only 
look for UserLeagueCell~iphone.xib.

p.s., good luck dealing with renaming UserLeagueCell~iPhone.xib to 
UserLeagueCell~iphone.xib if you've got it checked into svn.  The last time I 
made that mistake I found it was easier to just check in a brand new file with 
a different name all together (like UserLeagueCell2~iphone.xib) than to deal 
with the "but it is already checked out, even though the case is wrong"...


On Aug 17, 2011, at 7:56 AM, Jim Adams wrote:

> Did you check that cases of the names involved?
> 
> -Original Message-
> From: cocoa-dev-bounces+jim.adams=sas@lists.apple.com 
> [mailto:cocoa-dev-bounces+jim.adams=sas@lists.apple.com] On Behalf Of 
> Rick Mann
> Sent: Wednesday, August 17, 2011 12:35 AM
> To: Cocoa Developer
> Subject: +[UINib nibWithNibName:bundle:] and ~iPhone
> 
> I'm seeing some weird difference between Device and Simulator for iPhone.
> 
> Xcode 3.2.6
> Simulator 4.3(8F190)
> iOS 4.3.38J2)
> 
> I call
> 
> UINib* nib = [UINib nibWithNibName: @"UserLeagueCell" bundle: nil];
> 
> on the simulator, this actually seems to return the nib named 
> "UserLeagueCell~iPhone.xib". On the device, it returns the nib named 
> "UserLeagueCell.xib".
> 
> Is this a known difference in the two?
> 
> Thanks,
> Rick
> 
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Re: rightMouseDown: never called in NSView subclass

[glenn andreas]

The App Store approval guidelines is pretty clear that the use of non-public 
API is grounds for rejection.  NSToolbarView is undocumented, and therefore 
doing anything that depends on that class or its (undocumented) behavior would 
seem like grounds for rejection.  This would include adding a category to 
replace a method (which is fraught with peril regardless - categories aren't 
designed to replace existing methods, since you can't guarantee the loading 
order of categories from OS release to OS release - including minor updates), 
subclassing, method swizzling, or even testing to see if an object is one of 
those undocumented classes.

And even if it gets accepted, there is no guarantee that when you need to make 
an emergency update to fix some critical bug that somehow slipped through or 
later arose that you'd get accepted that time.

On Aug 25, 2011, at 11:46 PM, Indragie Karunaratne wrote:

> Is there any other way to do this aside from what I'm doing right now? As far 
> as I know, I have two choices:
> 
> a) Use this method and risk something breaking
> b) Write an NSToolbar clone
> 
> I know the risks, but if I could get this to pass through Mac App Store 
> submission then I'd rather deal with possibility of something breaking later 
> on that than to rewrite NSToolbar. The one last thing I can think of is to 
> use the ObjC runtime to retain the original implementation, swizzle hitTest: 
> and check whether my view is under the cursor, and if not, just call the 
> original implementation. However, method swizzling always feels like a dirty 
> workaround so I'm not sure if it would be much better than this (and if it 
> would be acceptable in the MAS).

Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: nonatomic vs atomic assign/retain

[glenn andreas]

On Sep 7, 2011, at 12:51 PM, Torsten Curdt wrote:

>>> So far I have never had to set an outlet itself in code myself. Do
>>> people really do this?
>> 
>> It's not common, but the point remains, outlets are not at all immutable.
> 
> AFAIK AppKit only writes to the outlets once. You may only access
> outlets only after a documented safe point. If one assumes that AppKit
> does not need synchronized access to the outlets during NIB loading
> the need for synchronization would depend entirely on how we as
> developers use the outlets. So whether they are technically immutable
> or not does not even matter. The question is whether synchronization
> is needed or not.
> 
> Of course if would be nicer if outlets would be declared as read-only
> and only the NIB loading had write access somehow - but I guess that's
> not in the cards.
> 
> Anyway. But I am curious - can you provide an example where you
> modified an outlet?

On iOS, a common technique to make complex table view cells is to put them in 
their own nib files, have a table view controller have:

@property (nonatomic, retain) IBOutlet UITableViewCell *loadedCell;

and then:

 - (UITableViewCell *)tableView:(UITableView *)tableView 
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: 
self.identifier];
if (!cell) {
[[NSBundle mainBundle] loadNibNamed:@"ComplexTableViewCell" 
owner:self options:nil]; 
cell = [[self.loadedCell retain] autorelease];
self.loadedCell = nil;
}
// configure and return cell...
}


Not to mention that retained IB outlets also need to be nil'ed out when the 
view is unloaded...


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: NSURLConnection: "Greedy Memory Eater" and Error 303

[glenn andreas]

On Sep 9, 2011, at 6:06 AM, Andreas Grosam wrote:

> Dir Members,
> 
> I'm trying to use a NSURLConnection to download a large data file (>10 MB) 
> from a web service to the iPhone. Currently, testing on iOS 4.2.1, on a 
> device. The connection is established over WIFI.
> 
> The problem I get with NSURLConnection is, that it internally uses a lot 
> (really a lot) memory for its data buffers. It seems, the connection reads as 
> much data as it can from the network and a tries to safe it in internal 
> buffers, no matter what, apparently until the system cannot provide more 
> memory.
> 
> In a simple test app, NSURLConnections quite quickly consumes up to 10Mbyte 
> for a number of its buffers - on the iPhone!, which is probably the maximum 
> before the app will be killed. With Instruments, it can be viewed quite 
> easily.


For another datapoint, I've got an app that can (optionally) download a 12.9MB 
data file which uses NSURLConnection, and it works fine - no threading, just 
the standard asynch delegate callbacks.  I need to make sure that I'm 
accumulating the data in a file instead of in memory (in 
connection:didReceiveData:), but there's no problem with crashing or other 
weird errors.



Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: NSDateFormatter refuses to format dates

[glenn andreas]

On Sep 27, 2011, at 9:53 AM, Gerriet M. Denkmann wrote:

>> 
>> In general, what happens if you temporarily remove the locale and time zone 
>> settings?
> The time zone settings have been already removed, because setting the locale 
> also sets the time zone.


NSLocale has no idea about time zones - the two are orthogonal.  NSLocale does 
know what NSCalendar to use (so doing setLocale: should mean that you don't 
need to do setCalendar:), but a given locale can have more than one time zone, 
and a single time zone can potentially cross multiple locales.

Not that that probably has a whole lot to do with NSDateFormatter returning 
empty strings...


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: [SOLVED] Re: Mystery of the missing symbol

[glenn andreas]

On Oct 2, 2011, at 9:37 PM, Don Quixote de la Mancha wrote:

>>> No, that's not something that the deployment target affects.  The whole 
>>> point of specifying one version via the SDK but an earlier version via 
>>> deployment target is that you can use the features of the later version 
>>> corresponding to the SDK _if you detect at runtime that they're actually 
>>> available_.
> 
> This is a problem on the iOS, because Apple doesn't support installing
> earlier firmware in our devices, in an effort to defeat jailbreaking.
> The only way I've found to test what firmware my app is compatible
> with is to use jailbreaking tools.  I shouldn't have to do that.
> 
> So far I'm satisfied that my app is compatible with iOS 3.0 and later,
> but I would like to ensure that it is compatible with 2.0 and later.
> There's no reason it shouldn't be, but I cannot get such an earlier
> firmware to install.
> 

That specific case is ultimately fruitless, since you can't submit an app to 
the AppStore that has a minimum required OS of 2.x - it needs to be 3.0 or 
higher.

Ultimate, if you need to support older OS versions, you need to keep older 
hardware around running that version (since newer hardware doesn't support 
running OS versions that are older than what was originally shipped with the 
device).



Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: adding something to a setter

[glenn andreas]

On Oct 6, 2011, at 6:28 AM, Torsten Curdt wrote:

> The property syntax is great until you need one more thing.
> 
> Think of a NSView and that view displays a value.
> 
> @synthesize value;
> 
> Now you also want to setNeedsDisplay: when a new value is set. So one
> can override the setter.
> 
> - (void)setValue:(NSString*)theValue
> {
>   ...
>   [self setNeedsDisplay:YES];
> }
> 
> but - you would have to implement the setter yourself. No big deal -
> but... it sucks.
> Is there a way to forward the setting to the originally synthesized
> setter? Super cannot be it.
> 
> Of course one could add another selector that to the interface
> 
>  - (void) setValueAndUpdateDisplay:(NSString*)theValue
>  {
>self.value = theValue;
>   [self setNeedsDisplay:YES];
>  }
> 
> ...but that sucks, too.
> 
> There gotta be a better way!
> How do you deal with this?


In your .m file, inside either the class extension or an "internal use only" 
class category, declare:

@property (nonatomic, retain) NSString *sideEffectFreeValue;  // or whatever 
property specifier were on the original property

and then synthesize it to use the original ivar

@synthesize sideEffectFreeValue=value;

and change your setter to:

- (void) setValue: (NSString *) value
{
self.sideEffectFreeValue = value;
[self setNeedDisplay: YES];
}


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Arc and performSelector

[glenn andreas]

On Oct 16, 2011, at 1:58 AM, Gerriet M. Denkmann wrote:

> I have this code:
>   
> for( id aThing in someArray )
> {
>   if ( [ aThing respondsToSelector: @selector(setTitle:) ] )
>   {
>   [ self  replaceIn:  aThing 
>   readSelector:   @selector(title) 
>   writeSelector:  @selector(setTitle:) 
>   withTable:  tableName 
>   ];
>   }
> }
> 
> 
> - (void)replaceIn: thing  readSelector: (SEL)selectorIn  writeSelector: 
> (SEL)selectorOut  withTable: (NSString *)tableName;
> {
>   NSString *key = [ thing performSelector: selectorIn ];
>   ...
>   NSString *rep = ...
>   [ thing performSelector: selectorOut withObject: rep ];
> }
> 
> Now, using Arc I am told that  "PerformSelector may cause a leak because its 
> selector is unknown".
> What I am supposed to do about this? I really want to have code without 
> warnings.


Based on your samples, why not change this to just use KVC instead?

for (id aThing in someArray)
if ([aThing respondsToSelector: @selector(setTitle:)]) { // too bad 
there isn't a cleaner way to ask [aThing hasKey: @"title"]
[ self replaceIn: aThing key: @"title" withTable: tableName ];
}
}

- (void) replaceIn: (id) thing key: (NSString *) ivarKey withTable: (NSString 
*) tableName
{
NSString *key = [thing valueForKey: ivarKey];
...
NSString *rep = ...
...
[ thing setValue: rep forKey: ivarKey];
}


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Using version number in code

[glenn andreas]

Or better use [[NSBundle mainBundle] objectForInfoDictionaryKey: ] since 
that will localize it if possible, which is important if you are presenting it 
to the user (unlikely that the short version will be localized, but the long 
one might be)

On Oct 21, 2011, at 10:59 AM, Martin Hewitson wrote:

> Chris,
> 
> You can get those values like this:
> 
> NSDictionary *infodict = [[NSBundle mainBundle] infoDictionary];
> NSString *bundleVersion = [dict valueForKey:@"CFBundleVersion"];
> NSString *shortVersion = [dict valueForKey:@"CFBundleShortVersionString"];
> CGFloat ver = [shortVersion floatValue];
> 
> Cheers,
> 
> Martin
> 
> On Oct 21, 2011, at 04:54 PM, Chris Paveglio wrote:
> 
>> In an app's Info.plist there are the 2 values for Bundle Version. Is there a 
>> way to use those directly in a class, in code? For example, I often like to 
>> put the version number of an app in the title bar or in part of the window 
>> (I mostly develop in-house for my company so UI standards can suit our 
>> needs, users can see immediately if it's the newest version). So far I've 
>> simply made a variable or set the version number directly (as a string) in 
>> my AppDelegate class, but if I could somehow use the Bundle Version or 
>> Bundle Version String Short that would be great. Any suggestions?
>> Chris
>> ___
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> 
> 
> Martin Hewitson
> Albert-Einstein-Institut
> Max-Planck-Institut fuer 
>Gravitationsphysik und Universitaet Hannover
> Callinstr. 38, 30167 Hannover, Germany
> Tel: +49-511-762-17121, Fax: +49-511-762-5861
> E-Mail: martin.hewit...@aei.mpg.de
> WWW: http://www.aei.mpg.de/~hewitson
> 
> 
> 
> 
> 
> 
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Re: UITextField and UIGestureRecognizers

[glenn andreas]

On Nov 10, 2011, at 9:41 AM, Matt Neuburg wrote:

> On Mon, 07 Nov 2011 17:32:46 +0100, Olivier Palliere 
>  said:
>> I have a UITextField on a view. I want the user to be able to edit it by 
>> single tapping on it, but I want to display a popover to chose from a list 
>> when the user does a long press on the UITextfield.
>> 
>> To do this, I added a LongPressGestureRecognizer on it and implemented the 
>> delegate in my controller. 
>> 
>> Now it works fine when I start my app, and I do a long press on the 
>> UITextfield until I edit it once. When I have edited my field using a single 
>> tap, if I try to do again a long press gesture, then my recognizer is 
>> ignored, the UITextField enters edit mode and the magnifying glass is shown.
> 
> But surely the real problem is that you're doing something you're not 
> supposed to do. A text field already gives a meaning to a long press 
> (selection), and now you're trying to disrupt that.
> 
> I recommend you show a menu item instead, which the user can tap to show the 
> list. Or some other alternate interface. *Use* the framework (by letting the 
> framework use you) - don't fight it. m.
> 

And it's pretty easy to add a button (or any other UIView) to the UITextField, 
on either the left or right side, with the option to display when the field is 
being edited, not being edited, or all the time:

@property(nonatomic,retain) UIView  *leftView;// e.g. 
magnifying glass
@property(nonatomic)UITextFieldViewMode  leftViewMode;// sets when 
the left view shows up. default is UITextFieldViewModeNever

@property(nonatomic,retain) UIView  *rightView;   // e.g. 
bookmarks button
@property(nonatomic)UITextFieldViewMode  rightViewMode;   // sets when 
the right view shows up. default is UITextFieldViewModeNever

Seems like putting a button in the rightView that displays when not being 
edited would work fit with what you described...


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: About iVars declaration and property

[glenn andreas]

On Nov 15, 2011, at 9:48 AM, Torsten Curdt wrote:

>>> If you’re 64-bit only (or if you require Lion or better), there’s no real 
>>> reason to explicitly declare the ivars these days.
>> 
>> As others have pointed out, this is not true. There are practical 
>> differences between declaring and not declaring the ivar explicitly. I 
>> almost never declare the ivar explicitly, but once in a while I need it to 
>> show up in the debugger or to be available in a subclass, and then I must 
>> declare it explicitly. m.
> 
> TBH what I don't get is why this cannot be changed in LLVM instead -
> then we would not have the 64-bit/10.7 restrictions.
> 
> Of course it would not change what's happening in the runtime but I
> guess most of people only care what they need to type anyway.


In four words: Fragile Base Class Problem.

The problem is that a subclass (in 32 bit OS X) needs to know the size of the 
superclass so it know how to lay out its ivars.  If there is no explicit ivars, 
there is no way for the compiler to know the size (since when it is compiling 
the subclass it doesn't see all the files that may potentially contain the 
parent's ivars).

Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Implementing Full Screen for 10.7 but app should also run on 10.6

[glenn andreas]

On Nov 16, 2011, at 3:08 AM, Stefan Werner wrote:

> 
> On 14.11.2011, at 19:20, Quincey Morris wrote:
> 
>> Don't follow the advice to define 
>> NSWindowCollectionBehaviorFullScreenPrimary yourself. It's really, really 
>> dangerous to replicate a fragment of one SDK in a build against an earlier 
>> SDK. What if the value changes in a later 10.7.x SDK, or if the value is 
>> invalidated in some way you can't foresee?
> 
> If that value changed in a later SDK, it would break binary compatibility. 
> While I strongly suggest against replicating SDK code in your own code for 
> the reason you're giving, it does not apply in this case.
> 
> Any application compiled today will have a constant number in place of 
> NSWindowCollectionBehaviorFullScreenPrimary. If the OS at some point changes 
> the meaning of that number, it will break all applications compiled before 
> that date.

Not necessarily.

There are a number of places where the frameworks check to see what SDK you 
link against to determine what behavior you get, just so that old apps (which 
are then linked against older SDKs) continue to work as they did, but new/fixed 
behavior is exhibited when linked against current SDKs.

So it could happen that, when X+1 is released, anything that links against X 
gets the old interpretation of a flag (first implemented in version X), but if 
you link against X+1 you get the new one.  And if you actually link against X-1 
(and manually add that flag from the X SDK) who knows what you'll get.  
Unlikely, but I wouldn't be surprised if this sort of thing hasn't bitten 
somebody at some point... (though probably with things like side effects of 
methods, and not different interpretations of constant flags)



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correlate all its contents - HPL

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Re: Home-brewed code is 100X faster than -[NSScanner scanDecimal:] ??

[glenn andreas]

On Feb 3, 2011, at 10:35 AM, Jerry Krinock wrote:

> -[NSScanner scanDecimal:] takes an average of 4 milliseconds to scan a short 
> string of decimal digits, which means tens of seconds for thousands of scans, 
> which is unacceptable for my application.  Also, excessive memory allocations 
> require a local autorelease pool around each invocation.
> 
> Surprisingly, I was able to fix both problem by replacing -scanDecimal: with 
> a rather bone-headed home-brew implementation, using 
> -scanCharactersFromSet:intoString: instead.  The home-brew implementation 
> runs 100 to 150 times faster.  How can this be?
> 

Your scanner doesn't correctly handle all valid decimals.

First, you don't handle scientific notation.

More importantly, you do not handle the full range of NSDecimal which is 
documented to be 38 _DECIMAL_ digits.  This is important because scanning in 
0.1 into a double will result in loss of accuracy (since 0.1 can't be expressed 
exactly in binary), where as NSDecimal will be able to handle it correctly.  
For that matter, 52 bits of mantissa on a double is only approximately 16 
decimal digits (no where near as close as the 38 decimal digits of NSDecimal).




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Re: Home-brewed code is 100X faster than -[NSScanner scanDecimal:] ??

[glenn andreas]

On Feb 3, 2011, at 3:05 PM, Jerry Krinock wrote:

> Thanks, Glenn, and thanks, Matt, for the explanation.
> 
> So I added a parameter to my method which one can use to get the performance 
> improvement only if they are willing to compromise accuracy and parsing of 
> numbers written in "e" notation.  Also, I chose a name which is less likely 
> to used by Apple.
> 

Why not just use NSScanner's scanDouble: instead of trying to scan a string 
that you think is valid and then convert to a double?

For example, if the input string is @"123.45-67.89" you'll end up scanning the 
entire string (which scanDecimal: or scanDouble: will only scan up through the 
"5").

Using scanDouble: will give you back support for scientific notation and 
consistent handling of "unexpected" strings, and all the other subtleness that 
can occur with floating point parsing (for example, you're code also misses 
handling things like "+123")

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Re: Outlets Not Connected In awakeFromNib

[glenn andreas]

On Mar 2, 2011, at 3:54 AM, Andreas Grosam wrote:

> I have a very basic custom UIViewController with its own associated nib file. 
> This view controller is the "root view controller" of a Navigation Controller 
> which is itself embedded within a Split View Controller which is defined in 
> another nib - say the main.nib.
> 
> Within IB this root view controller has its "Nib Name" property specified, 
> which means that this view controller is defined in an extern nib file.
> 
> This scenario is the standard way for defining nibs and view controllers when 
> using a Navigation Controller. 
> To illustrate an example for the main.nib:
> 
> File's Owner
> First Responder
> Window
> App Delegate
> Split View Controller
>Navigation Controller
>Navigation Bar
>Root View Controller-> Nib Name = "MyRootViewController.nib"
>Detail View Controller
> 
> 
> My root view controller also defines some properly specified outlets - for 
> instance a view which is embedded within the same nib file and referenced via 
> an outlet from the class. 
> 
> During -awakeFromNib for the root view controller, none of these kind of 
> outlets are connected. This is quite confusing, since the documentation 
> explicitly says otherwise.
> 

What's going on is that awakeFromNib is called when the nib containing the 
object is instantiated.  In this case, it is the main nib (which is where the 
root view controller "lives").

However, a view controller's nib ("MyRootViewControler.nib") isn't loaded until 
it is actually needed, at which point the view controller gets "viewLoaded" 
message, and so, until that time, any connections between the view controller 
and things loaded from MyRootViewController.nib will be nil.

> During -awakeFromNib for the root view controller, none of these kind of 
> outlets are connected. This is quite confusing, since the documentation 
> explicitly says otherwise.
> 

Not exactly - when awakeFromNib is called, all the connections within that nib 
are connected.  So if root view controller had an "appDelegate" outlet that was 
connected to the App delegate, that would be set when awakeFromNib was called.  
The "Nib Name = MyRootViewController.nib" is only an outlet in the sense that 
the view controller's nibName ivar will be set to "MyRootViewController.nib" 
(which it will be during awakeFromNib).

The whole purpose of having separate nibs is to avoid recursively loading 
everything all at once - if that view is never displayed (say, on a tab bar 
controller tab that the user never selects), its nib will never be loaded.



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Re: Notifications and Subclassing

[glenn andreas]

On Mar 8, 2011, at 9:42 AM, Gordon Apple wrote:

> Class A:  NSObject, has methods:
> 
> -  (void)foo:(Notification*)notification {
>...
> }
> 
> - (void)addObservers {
>[[NSNotificationCenter defaultCenter] addObserver:self
> selector:@selector(foo:)
> name:notificationName
>   object:nil];
> }
> 
> 
> Class B: subclass of A.  This is the class used.
> 
> Notification sent from elsewhere.  Console:
> 
> -[NSCFString foo:]: unrecognized selector sent to instance 0x69807c0
> 
> 
> Is this due to confusion of of which class received the notification?  Or is
> this a compiler/linker bug?  I even tried declaring foo in A’s headers, to
> no avail.  This same overall procedure is used elsewhere (without
> subclassing), with no problems.  What am I missing?
> 
> 
> 

That's a classic memory management problem.

Most likely, you're forgetting to unregister your observer when you are 
deallocating it (resulting in a notification center to have a stale pointer 
that is later reused by an NSString).


Glenn Andreas  gandr...@gandreas.com 
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Re: NSXMLParserDelegateAbortedParseError

[glenn andreas]

On Mar 8, 2011, at 3:13 PM, Josh Caswell wrote:

> Hi Kevin,
> 
> Thanks for your reply.
> 
> Sorry, maybe my explanation is not clear enough (I may have left out
> too many details). It's not a network error that I am talking about,
> but, as you say, an API error for which the server returns valid XML.
> 
> The specifics:
> I'm requesting weather data for a location by latitude and longitude.
> If I give the server a request that has, for example, a bad latitude,
> it will return valid XML, which parses fine, with an error element and
> a message describing the problem with the request:
> 
> http://www.w3.org/2001/XMLSchema-instance";
> xsi:noNamespaceSchemaLocation="http://na.unep.net/swera_ims/WS/SWERA.xsd";>110Latitude
> point must be between -90 and 90
> 
> If my parser comes upon an Error element, the delegate tells it to get
> the ErrorMessage contents and then aborts the parsing. Then the
> message ("Latitude point must be between...") is used for an alert
> sheet as I described.
> 
> I'm just wondering why, after my delegate aborts the parse, the parser
> changes the error code.
> 

Probably because the parser is reporting the "parse aborted" error?  From the 
header:

- (void)abortParsing;   // called by the delegate to stop the parse. The 
delegate will get an error message sent to it.

So you are getting an error because you aborted the parser (which knows not a 
thing about your concepts of "Error" and "ErrorMessage" as returned by the 
server):

- (NSError *)parserError;   // can be called after a parse is over to 
determine parser state.

This error is the parser state, which since you explicitly aborted the parse, 
will be something like "NSXMLParserDelegateAbortedParseError" -512.


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Reading RGBA pixel values from image on disk

[glenn andreas]

On Mar 10, 2011, at 12:47 PM, Leonardo wrote:

> I forgot: if I save the TIF from Photoshop marking the check-box "Save
> Transparency", on my App I can quite read the alpha channel, and the RGB
> values are not pre-multiplied. That's fine.
> Anyway, without the "Save Transparency", on my App I get the RGB values
> pre-multiplied and the alpha values are all 1.0, so I can't calculate the
> original RGB values. The weird point is that if I re-open this TIF file with
> Photoshop, the half-a-transparent pixels are well visible. So the alpha
> information has been properly stored within the TIF file, somewhere. I would
> like to know where.

TIFF file formats can include a wide range of tags, including "private use" 
ones that would be used by Photoshop to store whatever they want, up to, and 
probably including, the Ark of the Covenant (or in this case, some variation on 
a .psd file)

But bottom line is, if you are saving the file without transparency, that is 
what you are getting in the publicly documented parts of the file - it would be 
wrong for NSImage to use those private tags to give you anything other than 
what the file publicly presents (i.e., attempting to reading alpha from a file 
that has tags declaring it to not have alpha would be non-conformant with the 
TIFF spec).

Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: iOS Best Practice Question

[glenn andreas]

On Apr 26, 2011, at 4:36 PM, koko wrote:

> So we have one vote for:
> 
> 3. Use a view in a layer of the current view
> 
> Any other views (no pun intended) ... going once going twice  
> 
> Any comments against :
> 
> 1. Use UIAlert - easy but seems clunky
> 
> -koko


Adding additional content in UIAlert is not recommended, since it requires a 
high degree of care and verges on something that can get an app rejected from 
the App Store. (you've got to do special casing for different versions of the 
OS and make bad assumptions about the layout of the subviews, and will quite 
likely break when the next OS release happens).

In general, if you can avoid making a UIPickerView "appear" as the result of an 
action, you'll be better off.  Make it part of the UI, always available, or use 
a different mechanism (for example, in a table view, just push a second table 
view onto the navigation controller and let the user select the element from 
that table view, just like Settings.app does, etc...)



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Re: iOS nib weirdness...

[glenn andreas]

On May 4, 2011, at 9:00 AM, Steve Christensen wrote:

> I'm working on an app that uses a tab bar. I created a new nib to set up a 
> view+controller and added a new tab item to the main nib that references the 
> controller and the controller's nib, plus I filled in some basic 
> functionality in the view controller. Since it's relevant, the controller's 
> IBOutlets are
> 
> IBOutlet MyTableView* _resultsTable;
> IBOutlet UIActivityIndicatorView* _searchActivityIndicator;
> IBOutlet UISearchBar* _searchBar;
> 


First step:  Don't prepend your ivars with underscores.

From 
<http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CodingGuidelines/Articles/NamingBasics.html>,
 and I quote:

"   • Avoid the use of the underscore character as a prefix meaning 
private, especially in methods. Apple reserves the use of this convention. Use 
by third parties could result in name-space collisions; they might unwittingly 
override an existing private method with one of their own, with disastrous 
consequence."



You may be seeing one of those "disastrous consequences"



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Re: UIKeyboard (without Text filed)

[glenn andreas]

On May 24, 2011, at 5:28 PM, Jeffrey Walton wrote:

> Hi All,
> 
> Is it possible to display a keyboard and take input from (via a
> delegate) without using a text field?
> 
> There's not much reading from Apple's doc:
> http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=UIKeyboard+class+reference+site%3Aapple.com
> 
> Jeff

You can always have the text field be way off screen (that's the easy way, and 
works on older systems), or you can have a view that implements the various 
UIKeyInput protocol methods and have it become the first responder.


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Using a Soundex category...

[glenn andreas]

On Jul 6, 2011, at 1:23 PM, Eric E. Dolecki wrote:

> I found a Soundex NSString category here:
> 
> http://www.cocoadev.com/index.pl?NSStringSoundex
> 
> However, when I tried it out I get strange results...
> 
> //someString is set to different strings each time tested
> BOOL test = [someString soundsLikeString:@"Face"];
> NSLog(@"sounds like Face: %d",test);
> 
> Place = 0
> Ace = 0
> Mace = 0
> Fake = 1
> Testing = 0
> Brake = 0
> 
> It would seem something is off to get negatives on Place, Ace & Mace.
> 
> Any ideas or perhaps a different Soundex implementation I could try? I
> am already using Levenstein distance, but on it's own it's not good
> enough.

Soundex is based on having the first character providing a "unique" sound, with 
the rest of the character mapped together.

If you wanted to ignore that first character distinction, prepend your strings 
with a character like "X" that is unlikely to be a first character (since 
otherwise you'll get into trouble with its "drop double letters" step). The 
code appears to not care what the first character is (i.e., doesn't test for 
alphabetic characters), so you could probably use something like "#".


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: Reading old NSArchiver serialization, expecting CGRect, finding {?={?=ff}{?=ff}}

[glenn andreas]

Are you decoding it from a 64 bit app?  Because CGRect on 64 bits is made of 
doubles, while on 32 bits (where it was probably encoded) it was made of 
floats

Also, the exact format for @encode() varies greatly between compiler version 
(especially with regards for things like structure names vs ?, etc...).  This, 
in and of itself, shouldn't make it incompatible, but a structure with two 
structures each with two floats doesn't match with the double-based CGRect.

On Jul 13, 2011, at 12:20 PM, Philip Dow wrote:

> I am trying to decode a 3rd party archive encoded in the old NSArchiver (not 
> keyed) format. At a point in the decoding, I expect to find a CGRect, but 
> when I call 
> 
> [coder decodeValueOfObjCType:@encode(CGRect) at:&myRect]
> 
> an exception is raised with the error:
> 
> file inconsistency: read '{?={?=ff}{?=ff}}', expecting 
> '{CGRect={CGPoint=dd}{CGSize=dd}}'
> 
> Sure enough, if I open the file in a text editor, I see {?={?=ff}{?=ff}}.
> 
> According to the docs, the curly braces indicate a structure is encoded, 
> which I would expect for CGRect, but the ? indicates an unknown type. I'm 
> stumped for a solution and was wondering if anyone might have an insight.
> 
> ~Phil___
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Re: UIAlertView with UITextField

[glenn andreas]

And how well will that approach work with an updated release that moves things 
around to different locations?  Hint: many apps have broken with updated OS 
releases when system UI objects are changed internally.

Anything that hard codes in coordinate assumptions of system views is 
problematic - especially code like: 

[UITextField alloc] initWithFrame:CGRectMake(12.0, 45.0, 260.0, 25.0)]

or:

CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 
130.0); 
[self setTransform:translate];

The hard coding of coordinate values also can cause problems when running the 
OS with a non-English language (since the metrics of different languages can be 
different).


On Jul 27, 2011, at 12:47 PM, Dan Hopwood wrote:

> Thanks David. And do you or does anyone else know if Apple would permit
> implementing something like the following, which gives a very similar
> result:
> 
> http://iphonedevelopment.blogspot.com/2009/02/alert-view-with-prompt.html
> 
> Thanks,
> 
> Dan
> 
> 
> On Jul 27, 2011, at 18:14, David Duncan  wrote:
> 
> On Jul 27, 2011, at 10:02 AM, Dan Hopwood wrote:
> 
> This works really well and is exactly what I am looking for however a
> little reading tells me Apple may reject submissions that use this private
> API.
> 
> 
> Yes, you will be rejected for using private API.
> --
> David Duncan
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Re: Button width should accomodate localized string

[glenn andreas]

On Nov 29, 2009, at 9:38 AM, Symadept wrote:

> Hi,
> 
> How can I scale my button or Label to be able to accomodate the localized
> string?
> 
> Any clues.
> 
> Regards
> symadept

That's the whole purpose of being able to localize the nib/xib...


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Re: Contain touches within UIImageView only

[glenn andreas]

On Dec 2, 2009, at 12:23 PM, Chunk 1978 wrote:

> i have a custom class for a UIImageView which contains touch methods.
> at launch, the custom UIImageView is added (by interface builder) as a
> subview to the main UIViewController's view.
> 
> i can't seem to make the touch methods only trigger if they are within
> the custom UIImageView.  for some reason, touchesBegan works fine, but
> touchesMoved will continue to fire even if the CGPoint is no longer on
> the custom UIImageView

"For some reason" = "Because that's how it is suppose to work"

Consider the case of a button that remove highlighting if you tap on it and 
then drag off the button - if it didn't get the moved message when it was moved 
off the content, it would never know to remove the highlighting (and UIControl 
even implements a bunch of events for things like TouchDragEnter, 
TouchDragExit, TouchDragOutside, TouchUpOutside, etc...)

Once you get a touchesBegan for a UITouch, you should continue to get 
touchesMoved until your get a touchesEnded or touchesCanceled

How you treat the events (be they inside your content or not - and many control 
actually consider their content area to be much larger while tracking for 
better user experience), is entirely up to you.  You can always test their 
location and ignore them...



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Re: Question about touchesBegan

[glenn andreas]

On Dec 9, 2009, at 4:19 PM, Jack Carbaugh wrote:

> So in this case, would the SUBview want to send the SUPERview the 
> touchesbegan event ?
> 

>From the documentation (iPhone Application Programming Guide > Event Handling 
>> Touch Events > Handling Multi-Touch Events > Forwarding Touch Events):


Forwarding Touch Events
Event forwarding is a technique used by some applications. You forward touch 
events by invoking the event-handling methods of another responder object. 
Although this can be an effective technique, you should use it with caution. 
The classes of the UIKit framework are not designed to receive touches that are 
not bound to them; in programmatic terms, this means that the view property of 
the UITouch object must hold a reference to the framework object in order for 
the touch to be handled. If you want to conditionally forward touches to other 
responders in your application, all of these responders should be instances of 
your own subclasses of UIView.



It's definitely worth reading, and re-reading, those docs - all sorts of nice 
explanations of how touch handling is handled can be found there...


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Re: NSNumber stringValue

[glenn andreas]

 
On Saturday, December 12, 2009, at 11:32AM, "Ben Haller" 
 wrote:
>>> You should not compare floating point numbers for equality in most  
>>> cases. This is true of any language on any platform.
>>
>> Indeed, some floating-point numbers (such as the one represented by  
>> the integer 0x7fc0) will compare as not equal to themselves:
>
>   I think what the OP really wanted to know (and I'm interested in  
>the answer too) is whether going out to the stringValue and back to  
>the doubleValue is guaranteed to yield a float that is bitwise  
>identical to the original float, or whether there is "drift" in the  
>least significant bit or two due to the changes in representation.   
>Anyway, even if that's not the OP meant, that's what I'd like to  
>ask.  :->
>

It is absolutely not guaranteed to work - see 
.

To be able to convert base 2 (the binary representation) to base 10 (the 
textual representation) without a loss of precision is possible (since 2 is a 
factor of 10), though it potentially requires at least 17 digits (quick back of 
the envelope calculation of how many digits are in 1/2**24, given that a float 
has a 24 bit mantissa), and stringValue isn't documented as providing any 
specific number of digits of precision.

Going the other way, 0.1 (base 10) isn't possible to be represented exactly as 
a floating point number.


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Re: Intercepting events and touches in UIPickerView subclasses? (or, WTF is going in the UIPickerView's responder chain?)

[glenn andreas]

On Dec 18, 2009, at 6:00 AM, Sam Krishna wrote:

> Hi all,
> 
> So, I'm working on a client project where he wants to have ActionOne for 
> flicks on the UIPickerView and ActionTwo for non-flick selections.
> 
> When I subclass UIPIckerView, I explicitly follow the pattern of overriding 
> one of the standard methods for doing this kind of thing, and has worked 
> *very well* in the past: 
> 
> - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
> 
> Unfortunately, this method *never fires* in the UIPickerView's responder 
> chain (I suspect it has something to do with the highly-animated nature of 
> UIPickerView). The only methods I can get to fire to give me anything about 
> CGPoint information are:
> 
> - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
> - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
> 
> what's interesting about these two methods is that they don't have any 
> UITouch history with them. Sooo they are *mostly useless* also.
> 

Like a number of built in classes, UIPickerView is composed of a number of 
subviews which actually do the "interesting stuff" (not unlike the way a 
UIButton has a UILabel and UIImageView to actually draw a button).  As a 
result, it doesn't do anything, and overriding its touchesXXX methods doesn't 
do anything useful (since there's probably a scroll view like subview that's 
actually handling the events).


> I've considered applying a UIView on top of the Picker View to intercept the 
> touches and make gesture determinations, since that works very well. But 
> before I go down that road, I thought I'd ask the community what your 
> thoughts are about solving this problem. Again, all I need is for 
> touchesEnded:withEvent: to fire in the responder chain to get what I need.
> 

Putting a view on top of a built in view works well for doing things like 
adding things to the appearance of the object, but can be very problematic, 
since in order for your approach to work, you'll need to forward the events to 
the real UIPickerView, and forwarding events is extremely problematic.

>From the documentation (iPhone Application Programming Guide > Event Handling 
>> Touch Events > Handling Multi-Touch Events > Forwarding Touch Events):


Forwarding Touch Events
Event forwarding is a technique used by some applications. You forward touch 
events by invoking the event-handling methods of another responder object. 
Although this can be an effective technique, you should use it with caution. 
The classes of the UIKit framework are not designed to receive touches that are 
not bound to them; in programmatic terms, this means that the view property of 
the UITouch object must hold a reference to the framework object in order for 
the touch to be handled. If you want to conditionally forward touches to other 
responders in your application, all of these responders should be instances of 
your own subclasses of UIView.



So there are two solutions:
1) Roll your own UIPickerView implementation - surprisingly, not that difficult 
in many cases.  Basically make a UIScrollView (or your own subclass so you can 
examine the touch events), put a bezel image on top of it, and have each row be 
a subview inside the scroll view.  You'll need some work to handle things like 
reusing the row cells (since you probably don't want to create a scrolling view 
with hundreds of subviews).

2) Subclass UIApplication and override sendEvent: - this can get ugly from an 
architecture point of view (since you no longer have a nice little reusable 
view - you've got to do major surgery on the application itself), and 
sendEvent: does a whole lot of work that you'll want to be careful not to break.

Glenn Andreas  gandr...@gandreas.com 
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Re: passing a method name?

[glenn andreas]

On Dec 22, 2009, at 12:58 PM, Matt Neuburg wrote:

> On Tue, 22 Dec 2009 09:56:33 +1100, Graham Cox 
> said:
>> Regarding the use of different completion methods based on manipulating some
> common root name, I think that's a bit strange, misguided even.
> 
> But when the kind of situation that calls for it arises, it might seem very
> natural and elegant. I'm just suggesting that we not condemn an architecture
> out of hand merely because we've no experience of it. m.
> 

And isn't even that uncommon - consider all the various kvc methods based on 
common name (as an example of manipulating a common root name for multiple 
purposes).

And I've written menu validation code that manipulates the selector to figure 
out the name of the method to actually handle the validation (which is more of 
the "completion method" style thing - dynamically figure out what to call based 
on the SEL passed in)...




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Mad, Bad, and Dangerous to Know

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Re: Autorotation for a subview

[glenn andreas]

On Dec 22, 2009, at 1:01 PM, Matt Neuburg wrote:

> On Tue, 22 Dec 2009 12:51:35 -0500, "Eric E. Dolecki" 
> said:
>> I have a view which controls it's UI when rotated. However, if there is a
>> subView in place, it rotates and I'd like to control it's UI too. In my
>> subView the willAnimateRotationToInterfaceOrientation doesn't get fired. I
>> set up the shouldAutorotateToInterfaceOrientation. Does my main view need to
>> call something in my subView to get this to work? I'd think the subView
>> would get the event too but it doesn't.
> 
> This sounds like a good time for the view to post an NSNotification. The
> subview can then respond to it. m.


Or just mark the subview as needing layout and then have the subview figure 
things out in layoutSubviews.


Glenn Andreas  gandr...@gandreas.com 
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Re: Looking up a NSString constant at runtime

[glenn andreas]

On Jan 4, 2010, at 6:13 PM, Graham Cox wrote:

> 
> On 05/01/2010, at 11:03 AM, David Alter wrote:
> 
>> I can open a library and lookup a function by name using dlsym. These
>> constants are EXTERN. It seams there should be away to look these up as
>> well.
> 
> Functions are not the same, because a function's name is a necessary part of 
> the runtime. A constant's name is just a convenience for the programmer and 
> doesn't make it into the binary.
> 
> There is no built-in standard way to do this - you're on your own.


CFBundle has routines for looking up both functions and data by name.  It does 
require you figure out what framework the symbol comes from (and then get the 
corresponding CFBundle), but it is doable.




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correlate all its contents - HPL

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Re: NSDate without time portion

[glenn andreas]

On Jan 5, 2010, at 1:48 PM, Karolis Ramanauskas wrote:

>> 
>> By formatting the dates as MMDD and keeping them in strings you can use
>> simple string comparison to sort, compare and filter. They are also very
>> easy to format for display purposes. If you want to go standard then use the
>> ISO 8601 date format. It's -MM-DD. See
>> http://www.iso.org/iso/date_and_time_format
>> 
> 
> Great, but do not forget, in this case, to store time zone information too,
> perhaps in a separate string. Time offset won't do because it may change for
> the same time zone depending on daylight savings time. If I store date as a
> string, I also store the associated time zone's "name" property. NSDate is
> more than a plain date. It has time zone info embedded.

No it doesn't.  NSCalendarDate has a timezone, NSDate does not.

> Just try printing
> the same date object on daylight savings time date and not, and you will see
> the date object automatically adjusts the time. So, hypothetically if you
> stored 2009-12-31 as a string. Then created NSDate object from that string.
> It may later be interpreted as 2009-12-31 00:00:00 or, let's say 2009-12-30
> 23:00:00 or 2009-12-31 05:00:00, if the time zone of your user computer
> changes. Think, what if you user saves an appointment at 12:00:00 in New
> York and you store it as a string with no time zone info? In Chicago, that
> appointment will appear at 12:00:00 also even though it is really happening
> at 11:00:00.


NSDate conceptually store time relative to Jan 1, 2001, GMT.

When it is formatted for display, it uses the current time zone (or more 
correctly, the NSDateFormatter uses whatever time zone has been specified, or 
the current system time zone).  If your time zone changes (such as by daylight 
savings time, or changing the location), the resulting date will print 
differently, but timeIntervalSinceReferenceDate will be unchanged.  It is 
ultimately the date formatter that handles time zones, daylight savings time, 
etc...





Glenn Andreas  gandr...@gandreas.com 
 <http://www.gandreas.com/> wicked fun!
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Re: iPhone: CATransition done (get the key?)

[glenn andreas]

On Jan 13, 2010, at 11:18 AM, Eric E. Dolecki wrote:

> Is there a way to do it without retaining a reference? I could do that, but
> what is that key used for if not for referencing later somehow?
> 

The key is used by the layer, not the animation.  Animations are just generic 
"generators" that take a time value and create a value - it's up to the layer 
to decide what to do with that value.

You can always use CALayer's animationForKey: to find out if it the animation 
for a specific key:

if ([theLayer animationForKey:@"fadeIn"] == theAnimation) {
}




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Re: Snapshotting hidden UIViews

[glenn andreas]

On Jan 13, 2010, at 4:48 PM, Michael Gardner wrote:

> 
> I also tried calling -drawRect: on my hidden view (after setting the context 
> with UIGraphicsBeginImageContext()), but it doesn't seem to do anything.
> 
Many built in views do not draw anything at all (and have no useful drawRect:) 
- all of their rendering is handled by the view's layer.



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Re: Snapshotting hidden UIViews

[glenn andreas]

On Jan 13, 2010, at 9:46 PM, Michael Gardner   
wrote:



On Jan 13, 2010, at 5:07 PM, glenn andreas wrote:



On Jan 13, 2010, at 4:48 PM, Michael Gardner wrote:



I also tried calling -drawRect: on my hidden view (after setting  
the context with UIGraphicsBeginImageContext()), but it doesn't  
seem to do anything.


Many built in views do not draw anything at all (and have no useful  
drawRect:) - all of their rendering is handled by the view's layer.


Ah, that explains that. But I'd still very much like to know why the  
layer's -renderInContext: doesn't work consistently when the view is  
hidden.




Pure speculation, but a hidden view may not have a layer associated  
with it, and things like subview layout aren't done for hidden views  
(why waste cycle laying out the subviews if nobody will see it?).  
There are probably other undocumented optimizations as well on hidden  
views, such as animations not running, pending refreshes postponed,  
etc...  UIWebView is going to be especially problematic, since it does  
a whole lot of things in the background (such as loading needed images  
and other resources)


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Re: Displaying animated content in iPhone app

[glenn andreas]

On Jan 28, 2010, at 8:22 AM, patrick machielse wrote:

> I'm working on an iPhone application and I need some advice on displaying 
> animated content (think: cartoon like movies). Hopefully someone can point me 
> in the right direction.
> 
> Goal
> 
> The application needs to display short 2 second 'clips' of animated 
> characters in a loop. Animation can be triggered by tapping the screen.
> 
> So, what are the current options for displaying movie like content in your 
> app and have a decent control over playback and display?
> 

For simple "flipbook style" animation, you can load up all the frames as an 
array of UIImages and then use a UIImageView's animationImages to display them. 
 Doesn't give you a whole lot of control (you basically get to set the frame 
rate, number of times to loop and the frames) but this approach works 
reasonable for handling things like animated GIFs (provided that you write the 
code to decode the GIF files into the frames you need).

Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: NSXML and >

[glenn andreas]

The XML spec does not require '>' to be escaped as '>' (except in  
the case of ']]>' when that doesn't mark the end of a cdata section).   
Only '&' and '<' must be escaped - see section 2.4 of XML 1.0 spec.



Sent from my iPhone

On Feb 9, 2010, at 2:19 PM, Keith Blount  wrote:


Hello,

I'm using the NSXML classes to write out various strings, and it  
seems that these classes convert "<" to "<" but not ">" to  
">", which I find odd. For instance, consider the following code  
snippet:


NSXMLElement*element = [[[NSXMLElementalloc]  
initWithName:@"Test"stringValue:@"< & >"] autorelease];

NSLog (@"%@", element);

The output is:

< & >

Is this correct, or is this a bug? Or am I missing something? Do I  
therefore need to replace all occurrences of ">" with ">" myself  
to generate better XML?



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Re: ImageIO on iPhone

[glenn andreas]

On Feb 16, 2010, at 6:55 AM, sebi wrote:

> Hello,
> 
> I want to use ImageIO on the iPhone. However, the ApplicationServices 
> framework does not show up in the list, when i do the "Add -> Existing 
> Framework" command.

That's because ImageIO doesn't exist on the iPhone.

> When i just add the line
> #import 

There is no ApplicationServices framework on the iPhone.

> 
> I get some errors like 'CFXMLTreeRef' has not been declared (full list 
> below). I added the CoreFoundation framework (where CFXMLTreeRef is defined), 
> but no success. 
> I want to use ImageIO from C++, that should be possible, shouldn't it?
> 

Not on the iPhone - file an enhancement request...


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Hiding Glyphs

[glenn andreas]

On Jun 5, 2009, at 11:06 AM, Philip White wrote:


Hi,
  Well the text view is read-only for the user. I regret saying  
"diacriticals". I actually want to hide niqqudot and tashkil in  
Hebrew and Arabic. As far as I know, these are all separate  
characters.




If they are read-only, why not just filter the underlying string,  
replacing all occurrences of them with a zero-width space (0x200B), or  
potentially zero-width non joiner (0x200C) or zero-width joiner  
(0x200d) depending on how those character interact with the  
surrounding forms (either forcing or not forcing final/initial forms).



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
m.o.t.e.s. | minute object twisted environment simulation



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Re: Hiding Glyphs

[glenn andreas]

On Jun 5, 2009, at 6:45 PM, Martin Wierschin wrote:


The link for source code still seems to be working.


You know, that's the post I found a few months ago. Something is  
wrong with the linked file, of three compression program, one was  
able to decompress it but the result contained no source code.


Hrm, I can't decompress it either. You might contact Keith over at  
Literature & Latte- he's a nice developer and I'm sure he'd be happy  
to repost it.


Since that's the case, and your text isn't editable, it might be  
simplest to add a color attribute that matches the background  
color (eg: white) to all these characters. Certainly that would be  
easier than messing with the typesetter.


Your idea is cleverly simple. It just might work. It might act  
funny if the text is selectable though


Yeah, unfortunately the selection highlighting will give the trick  
away:



~Martin



What about [NSColor clearColor] instead of white?


Glenn Andreas  gandr...@gandreas.com
The most merciful thing in the world ... is the inability of the human  
mind to correlate all its contents - HPL


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Re: Number of images in main bundle folder (iPhone)

[glenn andreas]

On Jun 26, 2009, at 10:33 AM, Eric E. Dolecki wrote:

I would like to have a folder in the app act as the determining  
factor, I
looked at my target and it's flattened out. perhaps I need to use  
some kind

of file naming convention instead?



Or just use one of the several capabilities of Xcode to organize the  
results:
- You can copy the files via a separate "Copy Files" build phase,  
where you can specify that they be placed in a specific subfolder of   
the resources folder
- You can treat the source folder from whence the files came as a  
single unit, with its contents copied en-masse, by adding the folder  
as a reference instead of a group.
- You can manually copy the files where ever you want in a shell  
script build phase



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Re: [iPhone] Network connection between 2 iPhones

[glenn andreas]

On Jul 13, 2009, at 11:22 AM, James Lin wrote:


the usage scenario...

I want my app to obtain another iPhone(also running my app)'s IP  
address from a server.

After that, my app on my iPhone can send data to the other iPhone.
This means my app on another iPhone has to be waiting for this  
network traffic to arrive.


How can this be done?


In general, this will only work if the two phones are on the same  
local  network (such as on the wifi).  If that's the case, you can  
just use Bonjour for discovery and not even need a remote server.


Otherwise, for example, if the two devices are using 3G to connect to  
the internet, even if they are set up to accept connections, the cell  
network NAT will disallow incoming connections.  More complicated  
approaches (google "tcp hole punching" or "NAT Traversal") are needed  
for that (and I'm not sure that those techniques will work across cell  
networks).


You can, however, have both devices connect to the same remote server,  
and have it forward packets between them, but that approach does not  
scale well.


You're really going to have to do some more research on networking and  
peer-to-peer connections to understand the ramifications of trying to  
have one random device talk to another random device.


Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
quadrium2 | build, mutate, evolve, animate  | images, textures,  
fractals, art



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Re: Finding an available port for chat

[glenn andreas]

On Jul 17, 2009, at 9:08 PM, Development wrote:

I'm not trying to skirt around rules. Yahoo chat works on my  
machine, So did msn years back when I had it and so does teamspeak  
and ventrilo so I know there are ports out there that are free to be  
used I'm just not sure how to go about choosing one or if I should  
just hard code it. It's not a file exchange program just text chat  
and the two iPhones will communicate directly with each other rather  
than through my server since frankly I have high bandwidth demands  
as is. That and I cannot run a chat server daemon on the server  
since it's shared hosting rather than dedicated.


(As a nearly identical question asked less that a week ago -  
seriously, do some searching to turn up a wealth of suggestions and  
comments...):


In general, this will only work if the two phones are on the same  
local  network (such as on the wifi).  If that's the case, you can  
just use Bonjour for discovery and it will handle assigning port number.


Otherwise, for example, if the two devices are using 3G to connect to  
the internet, even if they are set up to accept connections, the cell  
network NAT will disallow incoming connections.  More complicated  
approaches (google "tcp hole punching" or "NAT Traversal") are needed  
for that (and I'm not sure that those techniques will work across cell  
networks).


You can, however, have both devices connect to the same remote server,  
and have it forward packets between them, but that approach does not  
scale well.


You're really going to have to do some more research on networking and  
peer-to-peer connections to understand the ramifications of trying to  
have one random device talk to another random device.





Glenn Andreas  gandr...@gandreas.com
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Re: [iPhone] get iPhone's IP address...

[glenn andreas]

On Jul 20, 2009, at 12:50 AM, James Lin wrote:


Hi all,

I found this code snipet that's supposed to return the iPhone's IP  
address.


I am wondering if anyone can confirm the method for me.
As i am told that this method works in an actual iPhone and not on  
the simulator.

But i won't have an iPhone until Aug 9th


As others have mentioned, this code has problems.  One major problem,  
however, is that there is no NSHost  available on the iPhone (it'll  
work on the Simulator, but isn't supported on the iPhone).


You should visit  devforums.apple.com - this issue has been discussed  
in detail and sample code that actually works can be found there...



Glenn Andreas  gandr...@gandreas.com
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Re: List classes in Bundle?

[glenn andreas]

On Jul 22, 2009, at 12:00 PM, Robert Mullen wrote:

Is there a way to actually list all the classes in a given bundle? I  
know I can look one up if I know the name but I would like to  
actually be able to present a list.


If the bundle is loaded, you should be able to iterate through all the  
classes in the system  (using the various routines in the runtime),  
and check to see if bundleForClass returns the bundle you are looking  
for.


If it hasn't been loaded, you can parse the macho file format and  
examine the objective-c sections, but that's a lot of work...



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rvalue vs lvalue (was Re: something I can't understand)

[glenn andreas]

On Jul 29, 2009, at 8:35 AM, Dragos Ionel wrote:


On Wed, Jul 29, 2009 at 3:24 AM, Agha Khan  wrote:

On Jul 28, 2009, at 7:59 PM, Kiel Gillard wrote:

On 29/07/2009, at 12:52 PM, Agha Khan wrote:


Hi:

I have a struct
@interface PngButton : UIButton
{
@public
  bool OffPos;
  CGPoint horizontalLoc;
  CGPoint verticalLoc;
}
@property (assign) bool OffPos;
@property (assign) CGPoint horizontalLoc;
@property (assign) CGPoint verticalLoc;
@end



No, you have an Objective-C class.

PngButton* pPngButton   = [PngButton

buttonWithType:UIButtonTypeInfoDark];
[pPngButton setFrame:CGRectMake(screenRect.size.width - 70.0,  
50.0, 36,

36)]; // No problem

pPngButton.verticalLoc   = CGPointMake((bVerticalDisplay ==  
YES) ? 250 :

410, 50.0);

I get an error
error: lvalue required as left operand of assignment

Why it is not working? I shouldn't get this error.
Any help will be very much appreciated.



Do you get any warnings?

Try this and see what happens:
pPngButton.verticalLoc = CGPointMake((bVerticalDisplay == YES ?  
250.0 :

410.0), 50.0);

Kiel




Hi:
Thank you for your reply.
Oh yes. It an Objective-C class.

regardless I place (bVerticalDisplay == YES) or not. The function  
silently

fails, with no warnings.
The I decided to
pPngButton.verticalLoc.x = (bVerticalDisplay == YES) ? 250 : 410;
This time I got warning.

error: lvalue required as left operand of assignment

Many thanks

-Agha




verticalLoc and x are readonly values, you cannot assign them.

use the frame property, first to retrieve it, change the x value and  
then to

reassign to the button.

something like

CGFrame frame = pPngButton.frame;
frame.x = ...;
pPngButton.frame = frame;

Dragos




No, that isn't correct at all - he's declared verticalLoc as a  
property that is perfectly valid to set (though, since this is the  
iPhone, should be declared as nonatomic as well)


The problem is that the (simplified) code:

pPngButton.verticalLoc.x = 410;

is equivalent to writing:

[pPngButton verticalLoc].x = 410;

since pPngButton.verticalLoc is used as a getter in this case (since  
your code then accesses the "x" field of the result).


This would be similar to:

CGPointMake(100,200).x = 410;

i.e., you call a function (which returns a CGPoint  value) and then  
you try to set one of the fields of the CGPoint value (which is then  
thrown away).


Things like structures returned from a function, or scalar values,  
pointers, etc... are referred to as "r-values", meaning they are  
values that appear on the right hand side of an assignment - they  
aren't stored in meaningful locations in memory, they just have a  
"value" but not "storage".  Variables (or memory locations) that can  
appear on the left hand side of an assignment are called "l-values" -  
they are values, but they also are stored somewhere and can have their  
values changed.


So what you'd need to do is:

CGPoint pt = pPngButton.verticalLoc;
pt.x = (bVerticalDisplay == YES) ? 250 : 410;
pPngButton.verticalLoc = pt.x;



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
Mad, Bad, and Dangerous to Know

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Re: UIWebView: prevent from displaying menu, Copy.

[glenn andreas]

Go to devforums.apple.com/community/iphone and search there - this has  
been discussed, with solutions, there...


Sent from my iPhone

On Jul 29, 2009, at 10:35 PM, norio ota  wrote:


Hi,

I'd like to prevent UIWebView from selecting an area and showing the  
"Copy" menu item.


I tried subclassing it and implementing touchesEnded:withEvent:.
But since I don't know if double-tap is the exact way to show the  
menu, I'm not sure if I omit the event using the topped count.
Furthermore, even if I placed a breakpoint at the beginning of the  
method, Debugger doesn't stop there.


For your info, the subclass has becomeFirstResponder method, and it  
is to return YES.


Any suggestions would be very appreciated.

Best regards,
Norio
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Re: [iPhone] networking

[glenn andreas]

On Aug 4, 2009, at 12:49 PM, James Lin wrote:

I am trying to make the iPhone a server and a client at the same  
time...


What I am trying to accomplish...

1. iPhone running my application opens a "server" socket and listens  
for incoming network connection from another iPhone running the same  
application.
2. The server socket has an "ip address" that i can register with my  
php/mysql server.
3. Another iPhone running my same app acts as the client gets the  
iPhone server's ip address from the server and make connection to  
the server iPhone.
4. The client iPhone sends a string "hello, I am James" to the  
server iPhone and the server iPhone reply with the user's choice of  
either "Hi, Nice to meet you" or "Get lost!" strings.



Unless the two phones are on the same local WiFi network, due to the  
way that various NATs (especially with cell phone networking), a  
client will almost certainly not be able  to connect to a server  
running on the phone.  Basically, the phone see only a local (private)  
network, and will have an address such as 10.3.5.12.  Unfortunately,  
that IP address is meaningless outside of local network (there is no  
way for a  remote phone, which may have the exact same address, to  
find 10.3.5.12 as being your local phone).


Given that trying to support phone based servers isn't going to work  
except for within the same WiFi network, you might as well instead use  
Bonjour for one  phone to discover the other phone (which will  
automatically handle finding/resolving/advertising ip address/ports).



Glenn Andreas  gandr...@gandreas.com
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Re: [iPhone] Webview stringByEvaluatingJavaScriptFromString

[glenn andreas]

On Aug 5, 2009, at 2:08 PM, Development wrote:



I'm trying to get a value for a specific variable to tell if a  
transaction is complete on iphone. In the didFinishLoading delegate  
method I have placed this code:


NSString * aString =[theWebView  
stringByEvaluatingJavaScriptFromString 
:@"document.getElementsByName(\"encrypted\").value"];

NSLog(@"AString: %@",aString);

The string is empty. I get nothing although I clearly have a field  
variable named encrypted in the html source of the page it is  
loading, and that field has a value because I have assigned it the  
value "Success!"

So I am concerned... What am I doing wrong?



Set a break point in the debugger at that point.

Use gdb to make sure that things are actually like you expect them to  
be, using a series of "po" commands calling [theWebView  
stringByEvaluatingJavaScriptFromString:] with various queries.


Since stringByEvaluatingJavaScriptFromString doesn't do any attempt at  
stringification of objects (and will return an empty string instead  
something like "[DOMElement]"), you'll probably want to do it  
manually, such as:


po [theWebView stringByEvaluatingJavaScriptFromString @"'' +  
document.getElementByName('encrypted')"]


That will show you if there really is something there like you expect.

Most likely, you're calling it at the wrong time, before the content  
has been fully loaded/rendered...




Glenn Andreas  gandr...@gandreas.com
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Re: [iPhone] networking

[glenn andreas]

On Aug 4, 2009, at 4:42 PM, Shawn Erickson wrote:

On Tue, Aug 4, 2009 at 11:13 AM, Luke the Hiesterman> wrote:


On Aug 4, 2009, at 11:10 AM, James Lin wrote:


Bonjour is for local area network, right?


No, Bonjour is applicable to any networking, local or wide area.  
Here's some

sample code.

http://developer.apple.com/iphone/library/samplecode/BonjourWeb/index.html


Well ad-hoc discovery only works on the local sub-net or across
bridged sub-nets. To do service discovery across sub-nets would
require a known DNS server publishing the existence of services and
how to contact them via public IP addresses.



Of course, in the context of the original question (re: iPhone  
networking), the iPhone is almost never going to have a public IP  
address (being hidden behind WiFi or cell phone NATs).



Glenn Andreas  gandr...@gandreas.com
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Re: NSURLCache

[glenn andreas]

On Aug 10, 2009, at 1:38 PM, Mike Manzano wrote:

Has anyone been able to successfully get the URL loading system on  
iPhone to pay attention to custom versions of NSURLCache? It seems  
to me that it's being ignored. More info here:


http://stackoverflow.com/questions/1246420/need-content-in-uiwebview-to-display-quickly

(See the second "answer" on that page).

Just need some sort of clue if I'm doing something wrong or if my  
code's just being ignored.



Yes, I've had it work - it just requires making your own cache  
instance and explicitly setting the shared cache to that new instance.


But it absolutely did work - once implemented, my "set the table view  
cell's image to an image from the net" works nicely (and without it  
scrolling was painful at best).


Glenn Andreas  gandr...@gandreas.com
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Re: UITableView updating problem

[glenn andreas]

On Aug 12, 2009, at 9:15 PM, DKJ wrote:

I've got a UITableView where the colour of the row text can change  
depending on its place in the table. For example, a row may change  
colour if it's moved from the bottom to the top of the table; and  
sometimes its colour may change if another row is deleted or inserted.


The problem is that the text colour is not updated until the table  
reloads its data. So (e.g.) if I move a row from the bottom to the  
top, its colour doesn't change immediately.


I'd like the text colours to be updated when the table leaves edit  
mode. But according to the docs, I can't call reloadData in the  
tableview controller's commitEditingStyle or moveRowAtIndexPath  
methods. (I tried doing it anyway, and got into trouble.)


Is there any way I can get the table to update as soon as the user  
presses the Done button? Or even better, as soon as the row deletion  
or move is completed?




You're using a sledge hammer (reloadData) when you need a small  
screwdriver.


When you are told of the row moving, you can access the cell used to  
draw that row (cellForIndexPath:) and then just adjust the color  
accordingly.  If you need to adjust other cells in that section, you  
can just loop through them, calling cellForIndexPath: for each one you  
want to adjust - if it is offscreen, it will return nil, so you can  
skip it.


This is also a good way to handle things like having a check mark  
selection... (change the accessoryType of the selected row, go through  
and remove the check mark from the previous one).



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
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Re: UITableView updating problem

[glenn andreas]

On Aug 13, 2009, at 8:44 AM, Brian Slick wrote:



On Aug 13, 2009, at 8:31 AM, glenn andreas wrote:

You're using a sledge hammer (reloadData) when you need a small  
screwdriver.


From UITableView.h:

- (void)reloadData; // reloads everything from  
scratch. redisplays visible rows. --> because we only keep info  
about visible rows, this is cheap.<-- will adjust offset if table  
shrinks



Watch this year's WWDC session on UITableViews - that's where the  
"sledgehammer" comment actually comes from.


reloadData is cheap, but it is still a sledgehammer approach (since it  
tears everything down and rebuilds everything).  Tweaking a setting of  
an existing view is far more surgical.





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Re: Best way to determine what ip address are assigned to a given network interface.

[glenn andreas]

On Aug 27, 2009, at 9:21 AM, Sherm Pendley wrote:

On Thu, Aug 27, 2009 at 10:09 AM, Mark McCray  
wrote:


I've seen a bunch of methods for getting a list of ip addresses  
that a

machine may have. But i haven't seen a Cocoa way of figuring out what
ip address is attached to a given interface.  NSHost give's you IPs
but which network interfaces those IPs are attached to.

Can this be done with the SystemConfiguration Framework?

Why do I need this? We know a bunch of our machines have many IPs but
we only care about ethernet ip addresses. and we typically only care
about ones that are en0 or en1. We want to write an application which
will give this information to us easily without the user having to go
into System Preferences.


If you know which interface(s) you want info about, you could run
"/sbin/ifconfig en0" with NSTask.



Or just use getifaddrs - no need to fork off an extra task and parse  
the output when you can just look at the information directly...



Glenn Andreas  gandr...@gandreas.com
 <http://www.gandreas.com/> wicked fun!
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Re: Unarchiving issues

[glenn andreas]

On Aug 2, 2010, at 12:46 PM, James Maxwell wrote:

>   // set the contents of the array
>   continuations = (float*)[aDecoder 
> decodeBytesForKey:@"continuations" returnedLength:&size];



>From the header file:

- (const uint8_t *)decodeBytesForKey:(NSString *)key returnedLength:(NSUInteger 
*)lengthp;  // returned bytes immutable, and they go away with the 
unarchiver, not the containing autorlease pool

And from the documentation:
Discussion
The returned value is a pointer to a temporary buffer owned by the receiver. 
The buffer goes away with the unarchiver, not the containing autorelease pool. 
You must copy the bytes into your own buffer if you need the data to persist 
beyond the life of the receiver.




So if your setContinuationSize: allocates memory, you should:

const uint8_t *bytes = [aDecoder decodeBytesForKey:@"continuations" 
returnedLength:&size];
NSAssert(size == [self continuationsSize] * sizeof(float), @"Bad size 
of bytes returned from decoding");
    memcpy(continuations, bytes, size);



Glenn Andreas  gandr...@gandreas.com 
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Re: [iPhone] UITableViewCell Height with UIWebView content

[glenn andreas]

On Aug 10, 2010, at 2:04 PM, Sandro Noël wrote:

> Greetings.
> 
> I've been trying to set the table view cell's height for a custom 
> tableviewCell containing a UIWebView
> to display attributed content but i cant's get the height properly.
> 
[snip]
> since it is so tedious, Now i'm thinking this is a design flaw on my part, 
> trying to resize a TableCellView with posibily big content.
> 
> any advice?
> 

Rethink your design - putting a UIWebView inside a UITableView is usually a bad 
idea for a number of reasons, including:
- not being able to tell the height of the view until far too late to be any 
good (UITableView needs to know before it is displayed, UIWebView can't know 
until after everything has been loaded)
- views which scroll vertically inside other views which scroll vertically can 
cause a bad user experience (though at least as of 3.x they work - in previous 
OSes the results were far less useful),
- UIWebView is a very heavy weight view, and UITableViewCells are designed to 
be light weight

You should probably put the resulting UIWebView in its own view controller, and 
push that as a disclosure of the table cell (or detail disclosure).

If your goal is just to display "styled text" inside a table row, you can use 
things like NSAttributedString/CoreText (or for pre 3.2 support, 
CFAttributedString & custom drawing routines).


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: CGImage to NSImage, or PDFPage?

[glenn andreas]

On Aug 10, 2010, at 4:45 PM, Brian Postow wrote:

> 
> I'm not sure if this is rightly a Cocoa question or Quartz, so I'm posting on 
> both lists. Sorry for the double...
> 
> I have a CGImageRef, and I need to put it into a PDFPage. At the moment, the 
> only way I see to do that is to turn it into an NSImage first. I've currently 
> got:
[snip]
> 
> Is there something obvious that I'm missing?
> 


How about -[NSImage initWithCGImage:(CGImageRef)cgImage size:(NSSize)size] if 
you're using 10.6, or use -[NSBitmapImageRep 
initWithCGImage:(CGImageRef)cgImage] and add it to an NSImage if you're using 
10.5?


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Re: NSKeyedArchiver on OSX to NSKeyedUnarchiver iOS

[glenn andreas]

On Aug 11, 2010, at 3:53 PM, Sandro Noël wrote:

> Greetings
> 
> I'm having problems unarchiving my data in the iphone.
> 
> here is the workout.
> 
> 1: I archive a AttributedString to my CoreData NSData property using 
> NSKeyedarchiver
> 2: Transfer the database to the iphone.
> 3: load the data using NSKeyedUnarchiver on the iphone.
> NSAttributedString *as = (NSAttributedString*)[NSKeyedUnarchiver 
> unarchiveObjectWithData:attributedStringData];
> 
> that crashes saying:
> -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class 
> (NSFont)
> 
> I understand that the NSFont is UIFont on the iphone, or has similarities.
> so i implemented a Delegate method to replace the class.
> //--
> - (Class)unarchiver:(NSKeyedUnarchiver *)unarchiver 
> cannotDecodeObjectOfClassName:(NSString *)name originalClasses:(NSArray 
> *)classNames{
>   if ([name isEqualToString:@"NSFont"])
>   return [UIFont class];
> 
>   return nil;
> }
> 
> but that never gets called because the class method does not allow for a 
> delegate and instantiating the unarchiver class confuses me in how I should 
> trigger the decoding once it is instantiated.
> 
> Any pointers ?

You're going to run into worse problems - UIFont is not NSFont, nor can you 
trivially substitute one for the other.

In general, while you can archive an NSAttributedString on OS X and unarchive 
it on iOS, it's not going to work the way you want it to.  Any of the 
"interesting" properties that define things like appearance of the string, are 
platform specific.  There is no "NSForegroundAttributeName", for example, on 
iOS, and even if you explicitly look for appropriate key, on OS X this will 
contain an NSColor, which, of course, does not exist on iOS (and UI color is 
similar, but the encoding of NSColor is undocumented, so even if you attempt to 
manually handle the decoding and try to make a UIColor, it would require that 
undocumented information - not to mention that there are parts of NSColor such 
as color space that don't exist at all on iOS).  Similarly for font 
information, paragraph style (including alignment, tabs, margins), embedded 
images, etc...

You might be able to get away with using CoreText and it's attributes (which 
are based on CG/CT objects like CGColor and CTFont), but obviously that's not 
what you're going to get from AppKits default attributed string support. So 
you'll probably have to give up on using AppKit's NSAttributedString extensions 
all together, and switch to the CoreText ones (and take advantage of the 
CFAttributedString/NSAttributedString toll free bridging).



Glenn Andreas  gandr...@gandreas.com 
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Re: who stole my UIView?

[glenn andreas]

On Aug 12, 2010, at 6:28 PM, Matt Neuburg wrote:

> Here's my code, simplified (and tested in this simple form) in order to
> demonstrate a mystery:
> 
> - (void) illuminate: (NSArray*) arr {
>UIView* v = [[UIView alloc] initWithFrame:self.view.bounds];
>NSLog(@"%@", v);
>CALayer* lay = [v layer];
>v.tag = 111;
>[self.view addSubview:v];
>lay.delegate = self; // <-- ***


Don't do that.

From 
<https://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIView_Class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-SW31>

Warning: Since the view is the layer’s delegate, you should never set the view 
as a delegate of another CALayerobject. Additionally, you should never change 
the delegate of this layer.



Basically you're break the underlying plumbing, connecting the cold water to 
the electrical, and wondering why your water tastes tingly...


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Re: Box soft shadow?

[glenn andreas]

On Aug 23, 2010, at 9:02 AM, Eric E. Dolecki wrote:

> I was asked to provide a soft drop shadow for a custom UIView class... and
> basically I am looking to create a soft shadow beneath a square opaque
> element. I'd like to do this without using a PNG. How would I do this? I am
> googling, and found something for text, but not just for a simple square
> shape.


Draw with CGContextShadow set appropriately, or set the shadow property of the 
CALayer of the UIView (if you are requiring iOS 3.2 or later)

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Re: UITableview scrollStyle

[glenn andreas]

On Sep 24, 2010, at 1:03 PM, Eric E. Dolecki wrote:

> Is white and black our only options for the scroller indicator in a
> UITableView? I was hoping to change mine to a blue since mine is on top of
> black and would match the design better.
> 

UITableView is a subclass of UIScrollView, so you can just set the scrollbar 
type.

However, like UIScrollView, you are limited to three choices - all black, all 
white, or black with a white border...



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Re: reused tableViewCell UILabel text is deallocated but not nil ??

[glenn andreas]

On Oct 7, 2010, at 11:30 AM, nicolas berloquin wrote:
>> 
>>> I turned on zombies, and I checked with the debugger, and the textLabel's
>>> _text is the deallocated instance
>>> (myName.titre is good).
>> 
>> This may be a red herring as the state of _text should not effect the 
>> ability to assign the property value, generally speaking.
> 
> Unless they compare the strings before they replace them which is what they 
> seem to do. 
> 
> I have changed my code to do a copy o the string before I assign it to the 
> label and it works. What I don't understand is why the API doesn't either 
> retain or copy it !!
> 

It probably does (and so needs to send a release to the old value).  What is 
likely happening is that you've got your memory management screwed up 
somewhere, and are over-releasing the (what will be the old) string value, 
which causes the text fields text ivar to point to garbage.


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Re: AM/PM letter UNICODE issues

[glenn andreas]

On Oct 18, 2010, at 12:19 PM, Alex Kac wrote:

> I'm fairly certain my problem here is that I wasn't thinking about unicode 
> terms here. 
> 
> What we are trying to do:
> Shorten the AM/PM to just the first character in Western Languages so that a 
> time is shown as "1:30a". 
> 
>   NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
>   NSString* am = [[[formatter AMSymbol] substringToIndex:1] 
> lowercaseString];
>   NSString* pm = [[[formatter PMSymbol] substringToIndex:1] 
> lowercaseString];
> 
> 
> This works in Western languages just fine.

Not sure that this is even true - in Germany, time is displayed normally using 
a "24 hour" notation (no AM/PM), and this true in many other locations as well. 
 See <http://en.wikipedia.org/wiki/Date_and_time_notation_by_country> for all 
sorts of other gory details and special cases.  Even for US cases, there are 
people who set their time format to use 24 hour time and so would expect to see 
"13:00" and not "1:00p".

Bottom line is trying to display time in a non-standard format is going to be 
problematic and have support issues.


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: RTFDFromRange returns different data

[glenn andreas]

On Nov 11, 2010, at 8:12 AM, gMail.com wrote:

> RTFDFromRange returns different data even if I do not change the variables
> mTextMutableString nor mDocAttributes. I just call several time:
> 
> NSData  *textData = [mTextMutableString RTFDFromRange:textRange
> documentAttributes:mDocAttributes];
> NSLog(@"textData %@", textData);
> 
> And 'every time' I get a different textData log text.
> Of course I compare the text starting from <
> 
> For example, at any call I get
> (this is the last changing part of the log text)
> 1)  edecdb4c b601  >
> 2)  2aebdb4c b601  >
> 3)  a6f8db4c b601  >
> 4)  bef8db4c b601  >
> 
> Why does RTFDFromRange returns a different data, even if the variables
> didn't change? How to get the same data? Is it a bug?



RTFDFromRange returns an archived (flattened) version of RTFD, which is 
undocumented but probably includes things like time stamps or unique IDs.  So 
it is not a bug - archiving the same original data is not guaranteed to return 
byte-for-byte identical archived results (but will return the same thing when 
unarchived).


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Running JavaScript in iOS WebView.

[glenn andreas]

On Nov 17, 2010, at 3:33 PM, Geoffrey Holden wrote:

> I've written an app for the Mac (which runs rather nicely) and now I'm trying 
> to port it to iOS (where it won't run at all).  The particular line of code 
> which is causing a problem is this:
> 
>   [webView stringByEvaluatingJavaScriptFromString:cmdStr]; 
> 
> cmdStr contains the following: 
> rcs.invoke(dojo.fromJson('{"pw":"password","type":"signIn","email":"geoff.hol...@45rpmsoftware.com"}'));
> 
> I'm using the JSON framework on Google code 
> (http://code.google.com/p/json-framework/), which (I'm assured) is iOS 
> compatible.  It certainly builds without trouble.  
> 
> The error I get when this line (fails to) execute is:
> 
> void SendDelegateMessage(NSInvocation*): delegate (webViewDidLayout:) failed 
> to return after waiting 10 seconds. main run loop mode: 
> GSEventReceiveRunLoopMode
> 
> I have got webViewDidFinishLoad (that's where this code is called) - so it 
> isn't that it's trying to run on nothing.
> 
> If you have any ideas about what I could do to fix this, I'd be most 
> interested to hear them!
> 

>From the documentation 
><http://developer.apple.com/library/ios/#documentation/uikit/reference/UIWebView_Class/Reference/Reference.html>:

JavaScript execution time is limited to 10 seconds for each top-level entry 
point. If your script executes for more than 10 seconds, the web view stops 
executing the script. This is likely to occur at a random place in your code, 
so unintended consequences may result. This limit is imposed because JavaScript 
execution may cause the main thread to block, so when scripts are running, the 
user is not able to interact with the webpage.



So one of your routines (I'm guessing rcs.invoke) is taking a long time (more 
than 10 seconds - perhaps it is waiting for some networked based action to 
complete).  So if your JavaScript code is waiting for completion, you're going 
to have to refactor that code to work more asynchronously and not block.



Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: iOS location enabled?

[glenn andreas]

On Nov 24, 2010, at 2:31 PM, Rainer Standke wrote:

> Hello,
> 
> wondering if there is a way to detect whether the location services are 
> enabled for the app. I am not after the global enabledness, but after the 
> enabledness of my app.
> 
> I imagine the OS stores this information somewhere, but can we get (read) 
> access to that programmatically?
> 

CLAuthorizationStatus status = [CLLocationManager authorizationStatus];


Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: NSTask with unzip

[glenn andreas]

On Nov 28, 2010, at 4:51 PM, Leonardo wrote:

> Great! Thanks for the advises.
> Now I have to zip and unzip a NSData (not a zip file) to a NSData.
> In other words, I have to zip and unzip "data to data", without using any
> file. Some idea?
> 
> -- Leonardo


A quick google search turns up several Cocoa zip frameworks out there that will 
avoid having to use NSTask, etc... all together.  While the zip file format is 
ugly, it is documented and you can always write your own to walk through a zip 
file to find the objects you want and use the standard zlib routines to do the 
compression/decompression.




Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Calculating Scale Factor touchesMoved event.

[glenn andreas]

On Dec 2, 2010, at 9:37 AM, Gustavo Adolfo Pizano wrote:
> now in my touches moved I do the following, the first part applies a
> rotation, which is working properly, except that after the first move
> the angle is 180 from what the view has, so you see that the view
> turns 180 degrees!!,

>   CGFloat a = atan2(-dx,dy);



atan2's parameters are declared as:

 double  atan2(double y, double x);




Glenn Andreas  gandr...@gandreas.com 
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correlate all its contents - HPL

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Re: [iOS] setting table style for root view controller of a navigation controller

[glenn andreas]

On Dec 2, 2010, at 11:47 AM, Matt Neuburg wrote:

> 
> On Dec 1, 2010, at 6:58 PM, Donald Hall wrote:
> 
>> I have come to the conclusion that what I wanted to do is not easily done 
>> unless the table view controller has its own nib file. In IB if you don't 
>> specify that the table view controller that is the root view controller of a 
>> navigation controller has its own nib file, there is no access to the actual 
>> table view in IB, so no way there to specify the table style. (The inspector 
>> window for a table view controller has no setting to specify the style.) 
>> Hitting the disclosure triangle for the custom table view controller in the 
>> main window nib file in that case only shows the Navigation Item - it 
>> doesn't show the table view. To access the controller's table view you have 
>> to have a separate nib file for the table view controller and tell the main 
>> window nib in the Attributes Inspector to load from this other nib.
> 
> This just isn't so. You say "Hitting the disclosure triangle for the custom 
> table view controller in the main window nib file in that case only shows the 
> Navigation Item - it doesn't show the table view." It doesn't show the table 
> view because you didn't put any table view there. If you drag a table view 
> into the table view controller, that becomes its view and now you can hook 
> everything up. This is in some ways not as convenient as putting the table 
> view in its own nib file, but you can certainly do it that way.
> 
> My own inclination, however, would be to go exactly the other way - no second 
> nib, no table view in any nib, and no UITableViewController in a nib either. 
> In fact, I probably wouldn't even use a UITableViewController at all. 
> UITableViewController doesn't get you anything much that you can't do in code 
> yourself.


Actually, it does a number of things for you:
1) It flashes the scroll bar correctly when the view appears
2) It can automatically deselect selected rows (in 3.2 and later)
3) Most importantly, it will handle dealing with keyboards showing up and 
covering part of the table view (and adjust the scroll/content inset), which 
can be a painful mess, especially trying to support both pre 3.2, and 3.2/4.x 
(since not only are the keyboard notifications different, but it deals with the 
view being presented in the variety of different ways - sheet, full screen, 
etc...)





Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: iOS when is my app launched

[glenn andreas]

On Dec 8, 2010, at 7:38 AM, Jason Bobier wrote:

> Hey Dave,
> 
> I'm talking about the Carbon equivalent of processLaunchDate in the 
> ProcessInfoExtendedRec. This is the actual date & time that the process 
> launched.
> 
> I want to use it to give my game's splash screen a consistent amount of time 
> on screen. Here's how:
> 
> I set the Default.png to the splash screen and immediately show the same 
> image when my app launches. I then check the launch date to determine how 
> much time it has shown and add x number of seconds to that.

Don't do that.

From 
<http://developer.apple.com/library/safari/#documentation/UserExperience/Conceptual/MobileHIG/IconsImages/IconsImages.html%23//apple_ref/doc/uid/TP40006556-CH14-SW1>:


Supply a launch image to improve user experience; avoid using it as an 
opportunity to provide:

• An “application entry experience,” such as a splash screen
• An About window
• Branding elements, unless they are a static part of your 
application’s first screen
Because users are likely to switch among applications frequently, you should 
make every effort to cut launch time to a minimum, and you should design a 
launch image that downplays the experience rather than drawing attention to it.



> 

So Default.png is not suppose to be a splash screen, and you're suppose to 
strive to make it go away as fast as possible - not figure out ways to display 
it for longer...


Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: execute system("some script") on behalf of root from non-root app

[glenn andreas]

Executing arbitrary scripts as root is also a potentially major security hole.  
Your goal should be to do as little as possible as root (or other elevated 
privileges), and with as little flexibility as possible.  

Security is hard, and if you don't understand the issues, you should take a 
step back and learn them before attempting to work them.  If you get them 
wrong, you've just exposed your customers to having their machine attacked.

On Jan 5, 2011, at 1:49 PM, Shawn Bakhtiar wrote:

> 
> 
> Search google is not an answer, although a good suggestion. Could you please 
> post the solution you came up with to the list. There are many ways to skin 
> this cat, I think we would all benefit from your experience.
> 
> Correct. You are NOT running them as root, but you can easily tell the script 
> to "sudo su" and go from there, which in effect will make you root.
> 
> Also have you looked at making the uninstaller be an apple script? 
> 
> Also does any one know if there is a setup program like there use to be on 
> Windows (IE Nullsoft)?
> 
> 
>> Date: Wed, 5 Jan 2011 21:40:09 +0200
>> From: eveningn...@gmail.com
>> To: n...@chronosnet.com
>> CC: cocoa-dev@lists.apple.com
>> Subject: Re: execute system("some script") on behalf of root from non-root   
>> app
>> 
>> Thanks Nick, i really should've googled before asking.
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correlate all its contents - HPL

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Re: How to scale a TabBarItem Image

[glenn andreas]

On Jan 26, 2011, at 5:10 AM, ico wrote:

> Hi All,
> 
> I want to add a UITabBar in my UIViewController, I don't want to use
> UITabBarController because I need to push this view controller into a
> navigation controller.


Don't do that.

>From the "View Controller's Guide for iOS":

Note: Although a navigation controller can be embedded inside a tab, the 
reverse is not true. Presenting a tab bar interface from within a navigation 
interface is potentially confusing for users. A navigation interface uses one 
or more custom view controllers to present an interface focused on one goal, 
which is usually the management of a specific type of data. By contrast, the 
tabs of a tab bar interface can reflect completely different purposes in an 
application and need not be related in any way. In addition, pushing a tab bar 
controller on a navigation stack would cause the tabs to be displayed for that 
screen only and not for any others.



What you are attempting to do is going to be an issue that can get prevent your 
app from being approved in the App Store.  Rethink your UI design and approach 
- you'll be better off in the long run...



Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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Re: Device/Resolution independent positioning of GUI items on iOS

[glenn andreas]

On Mar 19, 2012, at 3:22 PM, Brian Lambert wrote:

> Hi Alex,
> 
> Regarding you having to "repair" code where "UI elements that have been
> hardcoded in place with the approach of: Just define the CGRect and we're
> all good."  I think you're seeing things as being "gross" when they are not.
> 
> "Just define the CGRect and we're all good" is what IB does.  A XIB file is
> nothing more than a set of hardcoded values stored in XML vs. being
> hand-coded in Objective-C.
[snip]
> ...
> The programmer who hand-coded the label didn't do anything better or worse
> than the programmer who used IB to lay out a XIB file.  In fact, in some
> cases, it's way easier to "see" UI in Objective-C vs. Interface Builder.
> In Objective-C an experienced UI coder can "see" a bunch of controls, and
> all their properties, on one screen vs. having to click on each one and
> inspect their properties in Interface Builder.


Except that the runtime can easily substitute another XIB file dynamically to 
support different layout in iPhone vs iPad (or a different localization).

If you hard code this into your code, you've got to hard code in all the 
differences in device layout as well as any localization specialization.

Glenn Andreas  gandr...@gandreas.com 
The most merciful thing in the world ... is the inability of the human mind to 
correlate all its contents - HPL

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