非UIView动画：动画有时不播放，UIView动画：工作正常

Question

Sometimes when I run my app on the device, I guess about 20% of the time, animations such as:

[tableView setEditing:NO animated:YES];
[tableView setContentOffset:rect animated:YES];

and

[viewController0 pushViewController:viewController1 animated:YES];

do not animate but instantly change. But animations such as:

[UIView animateWithDuration:0.2
                     animations:^{
                         // do something
                     }
                     completion:^(BOOL finished) {
                         // do something else
                     }];

Work fine. Has this happened to anybody else? Not sure what could be causing it, it only happens on this one app, never happened on any other app and it only happens sometimes. Any help appreciated.

Edit:

Just want to clarify.

Animations that i create with 'animateWithDuration' work fine.

Sometimes animations from cocoa don't play for the entire time the app is running.

Answer 1

Try to set the UIView animation parameters before you push your viewcontroller.

Here's an example:

[UIView beginAnimation:nil context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:viewController1.view cache:NO];

[viewController0 pushViewController:viewController1 animated:YES];
[UIView commitAnimations];

Answer 2

Maybe it's because of the boolean u used. My animation is quite the same but it's working fine:

[UIView animateWithDuration:4.0 animations:^(void) {
        [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
        pfeil.alpha = 1.00;
         }];

thats my code...any questions?

Answer 3

Maybe you have a lot of data to load in your VC? if you load your data in main thread it stops all user interactions and UI responses for a while.