iphone - Triggering other animation after first ending Animation (Objective-C)

Question

I have a simple animation which simply modify the position of a button:

[UIView beginAnimation:nil context:nil];
[UIView setAnimationsDuration:3.0];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
mybutton.frame = CGREctMake(20, 233, 280, 46);
[UIView commitAnimations];

I want to perform some other animations when this one is finish, how to do that?

Answer 1

You could look at setAnimationBeginsFromCurrentState:. All the animations are run in their own threads, so [UIView commitAnimations] is a nonblocking call. So, if you begin another animation immediately after committing the first one, after appropriately setting whether or not it begins from the current state, I think you'll get the behavior you want. To wit:

[UIView beginAnimation:nil context:nil];
// set up the first animation
[UIView commitAnimations];

[UIView beginAnimation:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:NO];
// set up the second animation
[UIView commitAnimations];

Alternately, you could provide a callback by doing something like

[UIView beginAnimation:nil context:nil];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)
// set up the first animation
[UIView commitAnimations];

//...

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
    // set up the second animation here
}