An animation object drives change over time. While you have not yet used animation objects explicitly, all the animation in iPhone OS is driven by instances of the different animation classes. An animation object is an instruction set (“Move from point A to point B over 2 seconds”) that can be added to a
CALayer instance. Many properties of
CALayer can be animated by animation objects:
contents are just a few. When an animation object is added to a layer, that layer begins following the instructions of the animation.
The abstract superclass for all animation objects is
CAAnimation is responsible for handling timing; it has a ...