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# AVCaptureDevice.RotationCoordinator

A class that monitors the physical orientation of a capture device and provides adjustment angles to keep images level, relative to gravity.

```
class RotationCoordinator
```

## Overview

Correctly rotate the photos and movies your app captures, and optionally, a live camera preview, by applying a coordinator’s [`videoRotationAngleForHorizonLevelCapture`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/videoRotationAngleForHorizonLevelCapture) and [`videoRotationAngleForHorizonLevelPreview`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/videoRotationAngleForHorizonLevelPreview) properties, respectively. Each rotation coordinator instance updates its properties so that your app can observe them and immediately apply them to the relevant components.

## Topics

### Creating a rotation coordinator

[`init(device:previewLayer:)`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/init(device:previewLayer:))

Creates a coordinator that provides separate compensation angles for content your app takes with a capture device, and for your app’s camera preview.

### Compensating for a device’s rotation

[`videoRotationAngleForHorizonLevelCapture`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/videoRotationAngleForHorizonLevelCapture)

An angle the coordinator provides your app to apply to photos or videos it captures with the device so that they’re level relative to gravity.

[`videoRotationAngleForHorizonLevelPreview`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/videoRotationAngleForHorizonLevelPreview)

An angle the coordinator provides your app to apply to the preview layer so that it’s level relative to gravity.

### Inspecting a coordinator’s configuration

[`device`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/device)

The capture device the coordinator monitors to track its physical rotation.

[`previewLayer`](/documentation/AVFoundation/AVCaptureDevice/RotationCoordinator/previewLayer)

The layer that displays a camera preview the coordinator calculates a video rotation angle for.


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