Pauses a running animation at its current position.
- iOS 10.0+
- tvOS 10.0+
This method pauses running animations at their current values. Calling this method on an inactive animator moves its state to
UIView and puts its animations in a paused state right away. To resume the animations, call the
start method. If the animation is already paused, this method should do nothing. It is a programmer error to call this method while the state of the animator is set to