Changes

Each gesture action method is passed as an argument a UIGestureRecognizer sender object which may be used to extract information about the gesture. For example, information about the scale factor and speed of a pinch gesture may be obtained by the action method. Similarly, the action method assigned to a rotation gesture recognizer may ascertain the amount of rotation performed by the user and the corresponding velocity.

== Recognizing Tap Gestures ==

* UISwipeGestureRecognizerDirection.Down

Note that when programming in swift, the above constants may be abbreviated to .Right, .Left, .Up, and .Down.