On Fri, 04 Mar 2011 14:30:12 +0100, Andreas Grosam <[email protected]> said:
>So it seems, there is a problem performing UIViewAnimationOptionTransition...
>animations for the UIView transitionWithView:... class method, and possibly
>for transitionFromView:... invoked from -viewWillAppear: and viewDidAppear:.
My first thought is to wonder whether this is related to the problem I often
see where the *first* curl animation I ask for in an app is often not
performed, no matter how or when it's triggered. I have tried to work around
this by "priming the pump" (performing some harmless animation that wakes up
the animation world) but not with any great degree of success.
For example, my Zotz! app deals cards like this:
- (void) setCardWithAnimation: (Card*) newCard {
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration: 0.35];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self
cache:YES];
self.card = newCard;
[self setNeedsDisplay];
[UIView commitAnimations];
}
In a completely new game from a cold start, this doesn't work reliably for the
*first* trio of replacement cards. All three replacement cards just appear,
bang, without any animation. But this is not at the start of the game; the app
has been running for some time, and there have been other animations that have
appeared correctly. So perhaps it's no coincidence that this example has to do
with a curl animation, and perhaps what you're observing is this, and has
nothing to do with viewDidAppear: per se.
m.
--
matt neuburg, phd = [email protected], <http://www.apeth.net/matt/>
A fool + a tool + an autorelease pool = cool!
Programming iOS 4!
http://www.apeth.net/matt/default.html#iosbook_______________________________________________
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