ll us what you are
trying to accomplish. If you want to print the text in a text view, Yandy has
told you how – but where you put it will depend on what your purpose for
printing it is in the first place
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response to and you can figure out where
the calls belong.
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iPod Touch is a popular
development environment and should allow you to do most things that are not
phone specific.
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On Jan 2, 2010, at 6:29 AM, Alexander Spohr wrote:
> What is the do while good for?
It lets you reliably write constructs like:
if(condition)
MyMacro(foo);
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using the UIView 'center' or 'frame' property. There are a fair number of
samples that show this (look up the properties on UIView in the documentation
for links to the samples).
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You should not be releasing pnl because you do not own a reference to
it. The memory management rules explain why this is.
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On Jan 2, 2010, at 2:44 PM, Charles Jenkins
wrote:
Hello, everyone. I'm struggling through the steep Cocoa learning
curve, and
do with it further).
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pecific time before
storing them.
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, NSDate knows nothing about time zones, daylight's
savings time, etc. It is just an offset from Midnight 1/1/01 GMT. Everything
else is a display issue, and as the Core Data documentation warns you must
store the timezone information separately (which can also mean that you assume
a standa
map.m_pixelsx * 4, colorSpace,
> kCGImageAlphaNoneSkipFirst|kCGBitmapByteOrder32Host);
This code creates a bitmap without alpha.
> The problem is I just see garbage, no image. Clearly I am doing something
> wrong with the NSBitMapImageRep but I have no idea wh
mark the memory for the bitmap context as copy-on-write.
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mplete list of zip codes to validate against.
It might make more sense to see if your weather service can "fast fail" on an
invalid zip code, since they will likely maintain a valid zip code list, and if
you do it yourself you would want to maintain the same one they do.
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David Du
mance win, you should not do it in the name of
performance. But there may be other reasons to do so, although from some of the
other responses to this thread, it would seem that there are just as many other
reasons not to :).
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A
Jan 7, 2010 at 2:52 PM, Dave DeLong wrote:
>
>> That's backwards. NSArray is ordered; NSSet is not.
>>
>>
>>> On Jan 7, 2010, at 2:44 PM, David Duncan wrote:
>>>
>>>
>>> Since NSArray is unordered I would not expect its containsObject
vider, but doing that is straightforward. In the end, it is
about the same number of lines of code to create the image directly, and you
avoid the call into the kernel.
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ng the image isn't going to change either way. If
you have drawing performance issues, there are likely other venues that can
resolve that problem, but we would need performance metrics to know what is
your bottleneck.
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subview of the view controller's view in the XIB,
then this should not be necessary.
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On Jan 13, 2010, at 6:57 AM, Gustavo Pizano wrote:
> I want to get the actual size of the NSImage which I dragged into an
> NSImaveView that has the imageScaling to NSImageScaleProportionallyUpOrDown.
Does requesting the size from the NSImage not do what you want?
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. Once you've gotten the hang of what AppKit has
to offer (and it does have quite a bit to offer) then you can consider diving
deeper into using Core Animation directly.
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On Jan 13, 2010, at 9:17 AM, Gustavo Pizano wrote:
> On Jan 13, 2010, at 5:53 PM, David Duncan wrote:
>
>> On Jan 13, 2010, at 6:57 AM, Gustavo Pizano wrote:
>>
>>> I want to get the actual size of the NSImage which I dragged into an
>>> NSIm
On Jan 13, 2010, at 9:36 AM, Dave Fernandes wrote:
> On 2010-01-13, at 12:20 PM, David Duncan wrote:
>
>> That said, I don't see how you couldn't just calculate this yourself. Just
>> grab the size of the image, figure out what the less of the two scales you
>&g
a new layer, assign the contents
of the parent layer to that new layer's contents, then assign that layer as the
mask of all subviews. This may require a bit of futzing around to get right
however.
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a little fast on the exact usage of the mask – iirc,
you should only need to apply it to a common parent and it should affect all
children as well.
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but keep in mind
that the masking layer needs to be in the same coordinate space as the layer
masked. Simplest way to do this is to assign the masking layer's frame the
value of the layer to be mask's frame.
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return nil.
There are actually lots of ways to do this so I highly recommend you read the
documentation for that action, as the other methods may be useful in other
contexts.
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each layer type can specify which keys are implicitly
animated (and this can be further customized by developers). If you are saying
that CAOpenGLLayer has a different set of default implicit animations, thats
entirely possible, but they both should use the same mechanism.
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n with respect to
its contents.
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ontent of a layer, which in the case of a plain CALayer means that anything
drawn via -drawInContext: or -drawLayer:inContext: will be accessible via the
contents property.
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ether. If
you want to apply blend modes, you will have to do the rendering yourself with
that limitation in mind.
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Is this not possible?
It certainly is possible. I would recommend you take a look at the QuartzDemo
sample code, it shows almost exactly what you need to do.
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correctly. The contentsRect is a
rectangle in a unit coordinate system, which means that the coordinates range
from 0 to 1. Assuming your contents are 200x200, then the proper contentsRects
would be CGRectMake(0.5, 0.5, 0.25, 0.25) and CGRectMake(0.0, 0.0, 0.25, 0.25).
On Jan 22, 2010, at 1:57 PM, David Blanton wrote:
> So my question. "What is the 'proper' means of handling this situation?"
Rearrange the views to be siblings instead of parent-child in Interface Builder?
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filter
> I've written.
What is the specific problem you are seeing with the larger content? If you
mean the content is being resized downwards, then try changing the layer's
contentsGravity property to center (or one of the other non-resize variants).
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back
locally.
There is nothing for you to do, and nothing for you to fix. It is also not the
cause of your video issues (that I don't know).
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Pl
l not be
called until the thread terminates, which is likely your issue.
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prone (as well as allowing for a cleaner handoff of content).
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t; So, what are the current options for displaying movie like content in your
> app and have a decent control over playback and display?
As Glenn mentioned there is the UIImageView's animationImages property. You can
gain more control by dropping down to the Core Animation level as well.
it test to find the layer of interest instead, especially since
moving the layers around would mean moving the tracking areas around too.
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Please do
g and interacting even while refreshing large datasets like the one I
> cited.
You can create the images on a secondary thread, then pass them back to the
main thread for assignment. The heavy operation is the drawing, not the
uploading of drawn content. You may also want to consider culli
re in the view's internal (bounds)
coordinate system.
When view.frame.size != view.bounds.size this is trickier, but that is an
unusual case for layer backing, and I don't think it is your case.
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Co
rocess
to do it however, as using a small fixed number of tiles would make this very
slow as you would end up needing to respecify content you've already specified
(basically draw-upload-draw-upload).
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_
e doing. It will depend a lot on how much content you have and the
specifications of the system you are running on.
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either
fairly short or fairly small. Animating large images has issues with memory
usage that are difficult to overcome on most hardware (even on newer hardware
it would be difficult to get even 10s of fullscreen animation via frame-based
techniq
hip model, which is
confusing the analyzer. If you renamed your method to "newPDFDocumentRef" then
the analyzer wouldn't give you either error, as this would be in line with the
standard ownership model.
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r
> behavior.
Create only works with functions (CF convention). new only works with methods
(Cocoa convention).
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, although it is harder to tell in your
case due to the selection area. If you see colored highlights when you zoom in
on the image in one but not the other, then it is the issue I'm describing.
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uestion directly.
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, or if the
camera is capable of movies check +[UIImagePickerController
availableMediaTypesForSourceType:]. Compass can be detected via
-[CLLocationManager headingAvailable].
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led. What am I doing wrong here?
Layers (unlike views) start life validated. You need to call the layer's
-setNeedsDisplay method for your -drawInContext: method to be called, so you
should add a [lines setNeedsDisplay] call at some point.
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On Feb 11, 2010, at 4:50 PM, PCWiz wrote:
> Yep, I just tried that (sent a reply a minute ago) but the drawInContext:
> method still isn't being called.
Its because your layer is still sized 0,0. Not much you can draw into a layer
that size :).
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after. You may also want to consider
creating a UIView subclass that returns [CAGradientLayer class] from its
+layerClass method and exports methods to configure the gradient layer, then
you can do your layout in IB (although you would still need to configure it in
code).
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not guaranteed, but common) so the view's backing
store is interpreted as a white circle on a black background.
If you set opaque=NO, then you may get white on a clear background, but you can
only guarantee such behavior if you set backgroundColor=[UICo
On Feb 13, 2010, at 6:49 AM, Josh Tucker wrote:
> I'm loading a PDF stored locally into a UIWebView. Is there any way that I
> can achieve paging?
No, if you want paging you will have to implement your own PDF viewer. If you
use the UIWebView, you get what you get.
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f you are creating the view programmatically, -initWithFrame: should be fine.
If your loading from a nib, then -awakeFromNib is the appropriate place.
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osePath
call after you've specified the first round rect (instead of your
CGContextAddLineToPoint call).
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dButonsAnimation forKey:@"animateButton"]; otherwise the
> animation will fire, so to what layer should I add the CAAnimationGroup? or
> what shall I do?
Core Animation always copies an animation when you add it to a layer. Layers
cannot share animations, and you cannot group animations across
y they expect it to.
In the UIView case, the center property corresponds to the position property,
and the anchorPoint left at its default 0.5,0.5.
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P
ks are important, but its only 128 bytes... don't worry about it
:). File a bug with the conditions under which it reproduces and move on.
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Please do n
On Feb 24, 2010, at 1:02 PM, Gustavo Pizano wrote:
> mmm.. nice question... where is the link?
http://bugreport.apple.com
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not available.
There are various approaches that all involve doing the work yourself, which
means breaking the path apart into its components (CGPathApply) and doing the
interpolation yourself.
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Coco
all of your content, then animate
it so that it reveals that content.
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o trace through 2 points and end at the same
location (2,2). CGContextAddCurveToPoint generate a bezier curve that starts at
the current location, approaches the 2 control points (which are your various
combinations of min/mid/max x/y) and ends at the end point (which is always
t all.
But if you need to draw, you need to draw. All other methods of
getting content into a UIView (or more specifically the view's
CALayer) consume similar processing time in most cases.
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On Mar 6, 2010, at 6:57 PM, Jon wrote:
I get indications from readin
also
generally helps to not think about autorelease pools as anything more than an
implementation detail until you have gotten all of this down, as they won't
make a whole lot of sense to you until you understand how object ownership
works.
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his problem in the past but gave up as the animation was
>> optional.
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n
animations as the memory requirements grow rather quickly. I would generally
recommend that you break your animations down into constituent pieces and do
the animation in a combination of cycling images and code to move the views
presenting the animation.
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od without it being
> deallocated out from under me. But since I expect an instance variable to be
> valid after init returns, I had better retain it.
>
> Is that right?
Yes, this is what I meant.
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system that took instructions from a
resource file and built the views necessary and applied the animations dictated
by the resource. You can build a generic animation system in this manner and
potentially save considerable amounts of memory. Granted, doing so is not
necessarily a trivial exerci
iew that I am calling this code
> on is layer backed (set in interface builder).
The frame is not real, it is a property derived from the position, bounds.size,
transform and anchorPoint properties. If you want to animate the "frame" of a
layer, then you need to animate the position a
mplement controls as CALayers.
This is also an option, although you would need to do hit testing and
such yourself. For that reason alone I would probably go with option 1.
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Why not just change the view's center property?
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he tx & ty values in your
transform matrix. If you move the view's center, then you are updating
the view's center property. Either way its the same amount of work on
yoru part.
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something better that you can do here...
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not - read the man page x-man-page://3/sleep for details.
If you want something closer to a drift free timer, then you need to
determine when you want to wake up and use mach_wait_until() or a
higher level API to wait until that time.
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ng your test is
upside down?
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x27;s transform
however, then it is possible your text is going to be upside down.
The usual case of this is altering the text matrix, via
CGContextSetTextMatrix, as it is not saved when you save the drawing
state.
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The Core Animation instrument (and a few others) require you to target
the device rather than the simulator.
On Jun 13, 2009, at 2:46 PM, Chunk 1978 wrote:
how can i add core animation to the performance tools list? it, and
several others, are deactivated.
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ScrollView. If
the image is fairly large, then you may want to use a CATiledLayer
(but you will have to draw it via Quartz instead of via UIImage's draw
methods).
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reen (for example) then setting the view's center to the center of
the screen is a saner approach than using the transform matrix to do it.
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form of a view within the same animation
block and both animations will occur concurrently.
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tent of the layer, the
anchorPoint determines how the extent is positioned relative to the
position, and the transform is applied to that final rectangle to
determine the actual position on screen. The frame rectangle is then
extracted from t
but really its saying to place half of the bounds on either
side of the position.
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view.frame));
CGPoint c2 = view.center;
Then you will find that c == c2, c != visualCenter, and c2 !=
visualCenter.
This is why using translations for transforms is very confusing. You
expect the center of the view to change, but it does not. This is by
design.
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valid (if somewhat useless). It just puts them all in
the same bucket. If you want a better hash code, then you would have
to implement that yourself (I would probably do something with the
width, height, rowbytes and maybe some other parameters of the image.
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inside of -drawRect: and it should all be 100% related to
drawing the content of your view. You may read from various
properties, but you almost never set them.
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.
#import "StrokeView.h"
[self.view insertSubview:strokeViewClass atIndex:1];
totally doesn't work.
Where did you create the view? If you didn't create a view (either by
alloc/initWithFrame: or by adding it in a NIB and setting up an
outlet) then strokeViewClass is likely
es at <http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html
>
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gnized selector sent to instance 0x530f10'
Are you building with the 2.2.1 SDK and running on the iPhone OS 3
simulator? Perhaps the other way around? Either way, it is not a
supported configuration (the simulator OS must always match the SDK
used).
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ation just fine.
Please file a bug report on this issue.
One work around is to animate the contentsRect property instead of
contents and use the contentsRect to select a portion of a single
image that is assigned to the contents property of the layer.
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underlying view is redrawn
with the added image. What's the convenient way to avoid the
flickering?
Set the final value of the animation on the layer when you add the
animation. You'll want to disable actions when you change the current
value of the layer as well.
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enced from:
-[FlipsideView drawRect:] in FlipsideView.o
"_CGContextSaveGState", referenced from:
-[FlipsideView drawRect:] in FlipsideView.o
"_CGContextRestoreGState", referenced from:
-[FlipsideView drawRect:] in FlipsideView.o
"_CGContextSetFillColor", refe
here.
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views override should call [super layoutSubviews] first.
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hat are you trying to implement?
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not. About the only thing to keep in mind is that if you
do use a view controller, don't use the orientation change support.
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liar with that particular framework, but it is possible –
there are a lot of things that only work on the device.
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lower path on some devices.
- how you do it in OpenGL
You need to register for UIDevice orientation notifications and use
those notifications to rotate your modelview matrix.
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se at least). By
default a view (or layer) is not redraw when it is resized, but the
content is scaled. You want to change the contentMode on the UIView if
you want it to redraw (and understand that there is a performance
penalty for doing this).
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this task?
CGContextRotateCTM(UIGraphicsGetCurrentContext(), M_PI / 2.0);
[img drawAtPoint...];
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a CGImage directly instead of going through a bitmap
context, as this gives you more flexibility in what types of image
data you can represent, as well as avoiding a trip through the kernel
to mark the memory for the bitmap context as copy-on-write.
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