UIPanGestureRecognizer is a concrete subclass of
UIGestureRecognizer that looks for panning (dragging) gestures. The user must be pressing one or more fingers on a view while they pan it. Clients implementing the action method for this gesture recognizer can ask it for the current translation and velocity of the gesture.
- iOS 3.2+
- tvOS 3.2+
A panning gesture is continuous. It begins (
began) when the minimum number of fingers allowed (
minimumNumberOfTouches) has moved enough to be considered a pan. It changes (
changed) when a finger moves while at least the minimum number of fingers are pressed down. It ends (
ended) when all fingers are lifted.
Clients of this class can, in their action methods, query the
UIPanGestureRecognizer object for the current translation of the gesture (
translation(in:)) and the velocity of the translation (
velocity(in:)). They can specify the view whose coordinate system should be used for the translation and velocity values. Clients may also reset the translation to a desired value.