CAKeyframeAnimation
CPAnimatablePropertyContainer protocol (CPView)
CPAnimationContext
_CPObjectAnimator CPViewAnimator
CSS Animations wrapper

CPAnimatablePropertyContainerTest : animations of views with custom Layout / Regular Layout / Custom DrawRect: / No DrawRect: / Subviews / No Subviews and combinations of these situations.
controls animation (text field, button, popup, slider ...). They animate their size via their action.