Hello all,
I've now tried Dave's suggestion and it doesn't quite work. Please
take a look here:
http://www.restlessbrain.com/cocoa-dev/tab_bar2/
where you'll see a short video, a source file with the relevant pieces
of code that produce what you see in the video, and screen shots of
how 2 of the views (the 'intro' view and the game view), and their
background image views, are set up in IB.
Note how the sliding away of the tab-bar sort-of works, but not quite,
and note also how the game view image is oddly sized after the flip
transition. Additionally, there is a pair of highlights coming from
the two buttons in the game view which also appear displaced.
If anyone can shed some light on why these anomalies are happening,
I'd be very grateful.
Thanks!
Wagner
==========
Hi Dave,
yes, that's what I was considering trying but decided to ask the list
first. I'll give it a try later today and will report back one way or
the other, for the benefit of other people in the list.
Thanks for your input.
Wagner
On May 22, 2009, at 3:18 PM, Dave DeLong wrote:
Here's something that might work, although I haven't personally
tried it.
You know when the game view appears, via the -viewWill/DidAppear:
methods. You also know that your game view has a pointer to the
parent tabBarController, via UITabBarController * parentTabBar =
[self tabBarController];
You could easily resize parentTabBar's view in your viewWill/
DidAppear methods. If you want the bar to go away, then make the
parentTabBar.view.frame.size.height grow the height of the TabBar.
If you want it animated, do it in a [UIView beginAnimations:nil
context:nil] block.
In the other viewControllers, you'll need to resize the
UITabBarController's view back to its original size.
HTH,
Dave
On May 22, 2009, at 7:09 AM, WT wrote:
Hi Brian,
thanks for replying. Your suggestion didn't work and I suspect it
was because I'm not using a navigation controller. The UIView
documentation for the hidesBottomBarWhenPushed property seems to
suggest that it only has an effect when the view is pushed into a
navigation controller's stack.
In my app, the 4 views controlled by the tab-bar are not stacked,
so there is no need for a navigation controller more sophisticated
than the tab-bar controller. The only difference between the four
views, as far as navigation is concerned, is that switching into
the game view hides the tab-bar. One would reasonably think that
your suggestion would work in that case too, but it doesn't. :(
Wagner
On May 22, 2009, at 2:40 PM, Brian Slick wrote:
In the view you are animating in, perhaps in the -init method, you
can do this:
[self setHidesBottomBarWhenPushed: YES];
There may be a complication, since it looks like you would want to
do this on the top-most view controller for that tab. I've only
ever done it for subviews, so that the tab bar can reappear when
returning to the parent view. Maybe you could set this for the
'back side' view you are flipping in. Not sure.
Brian
On May 22, 2009, at 6:53 AM, WT wrote:
Hello,
when tapping one of the items in the tab-bar of my iPhone app,
I'd like to switch to a view that no longer has a tab-bar. I've
accomplished this already by having the tab-bar delegate remove
the tab-bar controller view from its superview (the window) and
then instal the new view. I even got it so that the two views
flip like in an utility app. Here's the code that does it:
[UIView beginAnimations: kAnimationIDSwitchIntoGameView context:
NULL];
[UIView setAnimationDelegate: self];
[UIView setAnimationDidStopSelector:
@selector(viewSwitchAnimDidStop:finished:context:)];
[UIView setAnimationDuration: kViewSwitchAnimDuration];
[UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:
UIViewAnimationTransitionFlipFromRight
forView: window cache: YES];
[tabBarController.view removeFromSuperview];
[window addSubview: gameViewController.view];
[UIView commitAnimations];
There are two things I'm not happy about though:
1. I'd like the transition to occur in two steps, where the tab-
bar first slides down until it's gone, followed by the view flip.
Is it possible to animate the tab-bar view's frame out of the
window? As a UIView, I'd think so but then the docs say that we
shouldn't access the tab-bar view directly. I suppose I could
just give it a try, but I thought I'd ask people's input first,
just in case there may be some gotchas to look out for.
2. Once the flip happens, the new view is oddly sized, with a gap
at the bottom whose size matches the status bar. I realize that
the tab-bar resizes its current controller's view as needed, and
I've tried several combinations of the options in IB (setting the
tab-bar's controller for that one item to auto-resize or not to
auto-resize its view and changing the autoresizing behaviors of
the view in question are the two most promising ones), but I
still can't get the new view to appear correctly sized. I must
admit that I don't really understand the precise rules followed
by the tab-bar controller in regards to resizing its current view
controller's view. Also, I suspect there's some code I have to
write to compensate for killing the tab-bar, but it's not clear
to me what it should be.
You can see what I'm referring to here:
http://www.restlessbrain.com/cocoa-dev/tab-bar.mov
http://www.restlessbrain.com/cocoa-dev/bg_imgview_IB_1.png
http://www.restlessbrain.com/cocoa-dev/bg_imgview_IB_2.png
http://www.restlessbrain.com/cocoa-dev/gameview_IB_1.png
http://www.restlessbrain.com/cocoa-dev/gameview_IB_2.png
http://www.restlessbrain.com/cocoa-dev/tabbar_IB.png
Any help is greatly appreciated.
Wagner
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