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# UIPinchGestureRecognizer

A continuous gesture recognizer that interprets pinching gestures involving two touches.

```
@MainActor class UIPinchGestureRecognizer
```

## Overview

[`UIPinchGestureRecognizer`](/documentation/UIKit/UIPinchGestureRecognizer) is a concrete subclass of [`UIGestureRecognizer`](/documentation/UIKit/UIGestureRecognizer).

The user must press two fingers on a view while pinching it. 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.

Pinching is a continuous gesture. The gesture begins ([`UIGestureRecognizer.State.began`](/documentation/UIKit/UIGestureRecognizer/State-swift.enum/began)) when the user moves the two fingers enough to create a pinch gesture. The gesture changes ([`UIGestureRecognizer.State.changed`](/documentation/UIKit/UIGestureRecognizer/State-swift.enum/changed)) when a finger moves (while both fingers remain touching). The gesture ends ([`UIGestureRecognizer.State.ended`](/documentation/UIKit/UIGestureRecognizer/State-swift.enum/ended)) when the user lifts both fingers from the view.

## Topics

### Interpreting the pinching gesture

[`scale`](/documentation/UIKit/UIPinchGestureRecognizer/scale)

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

[`velocity`](/documentation/UIKit/UIPinchGestureRecognizer/velocity)

The velocity of the pinch in scale factor per second.


---

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