Objective-C's UIView and animationIDs

What are all the valid a开发者_如何学CnimationID strings for the beginAnimations:: class method on UIView?

The animationID is any string you decide to use. It's for identifying the animation in the animations's willStart and didStop delegate methods.

From the documentation:

animationID Application-supplied identifier for the animations within a block that is passed to the animation delegate messages—the selectors set using the setAnimationWillStartSelector: and setAnimationDidStopSelector: methods.