Class

UIPinch​Gesture​Recognizer

UIPinch​Gesture​Recognizer is a concrete subclass of UIGesture​Recognizer that looks for pinching gestures involving two touches. When the user moves the two fingers toward each other, the conventional meaning is zoom-out; when the user moves the two fingers away from each other, the conventional meaning is zoom-in.

Overview

Pinching is a continuous gesture. The gesture begins (began) when the two touches have moved enough to be considered a pinch gesture. The gesture changes (changed) when a finger moves (with both fingers remaining pressed). The gesture ends (ended) when both fingers lift from the view.

Symbols

Interpreting the Pinching Gesture

var scale:​ CGFloat

The scale factor relative to the points of the two touches in screen coordinates.

var velocity:​ CGFloat

The velocity of the pinch in scale factor per second.

Relationships