Tells the object when a button is released.
- iOS 9.0+
- tvOS 9.0+
The event to which the presses belong.
UIKit calls this method when the user stops pressing one or more buttons. Use this method to take any needed actions in response to the end of the press.The default implementation of this method forwards the message up the responder chain. When creating your own subclasses, call
super to forward any events that you do not handle yourself.