CAAction interface is implemented by objects that respond to CALayer actions.
CAMediaTiming interface consists a protocol that incorporates timing properties related to CAAnimation objects like duration, beginTime and repeatCount .
CAAnimation class is an abstract class used as a base class for animations.
CALayer class defines an object that is responsible for handling image content providing animation options along with storing support.
A CALayer which defines a path to use as a drawing layer
CATransition class defines transition animations for layers.
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