ViewAnimatingPosition
Constants indicating positions within the animation.
public enum ViewAnimatingPosition: Int 
Inheritance
Int
Enumeration Cases
  end 
 The end point of the animation. Use this constant when you want the final values for any animatable properties — that is, you want to refer to the values you specified in your animation blocks.
case end
  start 
 The beginning of the animation. Use this constant when you want the starting values for any animatable properties—that is, the values of the properties before you applied any animations.
case start
  current 
 The current position. Use this constant when you want the most recent value set by an animator object.
case current