The Core iOS Developer’s Cookbook, Fifth Edition

Building Animations with Blocks

Blocks constructs simplify the creation of basic animation effects in your code. Consider the following snippet, which produces a fade-out effect for a view with a single statement in an embedded block:

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[UIView animationWithDuration: 1.0f     animations:^{contentView.alpha = 0.0f;}];

Adding a completion block lets you tidy up after your animation finishes. The following snippet fades out the content view and then removes it from its superview when the animation completes:

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[UIView animationWithDuration: 1.0f     animations:^{contentView.alpha = 0.0f;}     completion:^(BOOL done){[contentView removeFromSuperview];}];

When you need to add further options ...