Sets the delegate for any animation messages.
- iOS 2.0+
- tvOS 9.0+
You can specify an animation delegate in cases where you want to receive messages when the animation starts or stops. After calling this method, you should call the
set methods as needed to register appropriate selectors. By default, the animation delegate is set to
You primarily use this method to set the delegate for animation blocks created using the begin/commit animation methods. Calling this method from outside an animation block does nothing.
Use of this method is discouraged in iOS 4.0 and later. If you are using the block-based animation methods, you can include your delegate’s start and end code directly inside your block.