Re: animating addSubview with iOS4
Re: animating addSubview with iOS4
- Subject: Re: animating addSubview with iOS4
- From: Andreas Grosam <email@hidden>
- Date: Wed, 02 Mar 2011 12:42:53 +0100
On Mar 2, 2011, at 11:37 AM, Robert Vojta wrote:
> I meant viewWillAppear/viewDidAppear, not disappear ... Sry ...
This might not work also. If the boolean parameter 'animation' in viewWillAppear equals NO, no animation will be started.
This is especially true when the view will appear immediately after it has been loaded.
Martin,
you might do the following:
In your view controller:
- (void) addButtonWithAnimation {
[UIView transitionWithView:self.view
duration:1.0
options:UIViewAnimationOptionTransitionCurlUp
animations:^{ [self.view addSubview:self.button]; }
completion:NULL];
}
- (void) viewDidLoad {
[super viewDidLoad];
// Create the button:
// ...
[self performSelector:@selector(addButtonWithAnimation) withObject:nil afterDelay:0.0];
}
The -performSelector:withObject:afterDelay: ensures that the method -addButtonWithAnimation will be scheduled after the current iteration of the event loop finished. It appears, that within the event loop where -viewDidLoad is being processed no animation can be started.
Note also that -viewDidLoad is rarely the appropriate method to start animations, though. A view can be unloaded / loaded in cases of low memory events. For very simple problems, where you just want to put up a nice and simple animation when some view starts up, this might be ok.
This of course curls up the *container view* - that is the view controller's view, not the button.
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