Class

UIRotationGestureRecognizer

A concrete subclass of UIGestureRecognizer that looks for rotation gestures involving two touches.

Declaration

class UIRotationGestureRecognizer : UIGestureRecognizer

Overview

When the user moves the fingers opposite each other in a circular motion, the underlying view should rotate in a corresponding direction and speed.

Rotation is a continuous gesture. It begins when two touches have moved enough to be considered a rotation. The gesture changes when a finger moves while the two fingers are down. It ends when both fingers have lifted. At each stage in the gesture, the gesture recognizer sends its action message.

Topics

Interpreting the Gesture

var rotation: CGFloat

The rotation of the gesture in radians.

var velocity: CGFloat

The velocity of the rotation gesture in radians per second.

Relationships

Inherits From

Conforms To

See Also

UIKit Gestures

Handling UIKit Gestures

Use gesture recognizers to simplify touch handling and create a consistent user experience.

Coordinating Multiple Gesture Recognizers

Discover how to use multiple gesture recognizers on the same view.

class UILongPressGestureRecognizer

A concrete subclass of UIGestureRecognizer that looks for long-press gestures.

class UIPanGestureRecognizer

A concrete subclass of UIGestureRecognizer that looks for panning (dragging) gestures.

class UIPinchGestureRecognizer

A concrete subclass of UIGestureRecognizer that looks for pinching gestures involving two touches.

class UIScreenEdgePanGestureRecognizer

A gesture recognizer that looks for panning (dragging) gestures that start near an edge of the screen.

class UISwipeGestureRecognizer

A concrete subclass of UIGestureRecognizer that looks for swiping gestures in one or more directions.

class UITapGestureRecognizer

A concrete subclass of UIGestureRecognizer that looks for single or multiple taps.