Starts running the animation represented by the receiver when another animation reaches a specific progress mark.
- macOS 10.4+
NSAnimationobject with which the receiver is linked.
floatvalue (typed as NSAnimationProgress) that specifies a progress mark of the other animation.
This method links the running of two animations together. You can set only one
NSAnimation object as a start animation and one as a stop animation at any one time. Setting a new start animation removes any animation previously set.