Best Way to Perform Several Sequential UIView Animations?

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If you’re willing to step up to iOS 4.0, the new blocks-based animation approach can make this animation chaining trivial. For example:

[UIView animateWithDuration:1.0 animations:^{ view.position = CGPointMake(0.0f, 0.0f); } completion:^(BOOL finished){
    [UIView animateWithDuration:0.2 animations:^{ view.alpha = 0.0; } completion:^(BOOL finished){
        [view removeFromSuperview]; }];
}]

will cause view to animate to (0, 0) over a duration of 1 second, fade out for 0.2 seconds, then be removed from its superview. These animations will be sequential.

The first block in the +animateWithDuration:animations:completion: class method contains the property changes to animate at once, and the second is the action to be performed on completion of the animation. Because this callback can contain another animation of this sort, you can nest them to create arbitrary chains of animations.

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