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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