Class

UIPan​Gesture​Recognizer

UIPan​Gesture​Recognizer is a concrete subclass of UIGesture​Recognizer 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.

Overview

A panning gesture is continuous. It begins (began) when the minimum number of fingers allowed (minimum​Number​Of​Touches) 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 UIPan​Gesture​Recognizer 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.

Symbols

Configuring the Gesture Recognizer

var maximum​Number​Of​Touches:​ Int

The maximum number of fingers that can be touching the view for this gesture to be recognized.

var minimum​Number​Of​Touches:​ Int

The minimum number of fingers that can be touching the view for this gesture to be recognized.

Tracking the Location and Velocity of the Gesture

func translation(in:​ UIView?)

The translation of the pan gesture in the coordinate system of the specified view.

func set​Translation(CGPoint, in:​ UIView?)

Sets the translation value in the coordinate system of the specified view.

func velocity(in:​ UIView?)

The velocity of the pan gesture in the coordinate system of the specified view.

Relationships