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# AVCaptureSessionControlsDelegate

A protocol that defines the interface to respond to capture control activation and presentation events.

```
protocol AVCaptureSessionControlsDelegate : NSObjectProtocol
```

## Topics

### Responding to control events

[`sessionControlsDidBecomeActive(_:)`](/documentation/AVFoundation/AVCaptureSessionControlsDelegate/sessionControlsDidBecomeActive(_:))

Tells the delegate when a capture session’s controls become active and available for interaction.

[`sessionControlsWillEnterFullscreenAppearance(_:)`](/documentation/AVFoundation/AVCaptureSessionControlsDelegate/sessionControlsWillEnterFullscreenAppearance(_:))

Tells the delegate when a capture session’s controls are about to enter a fullscreen appearance.

[`sessionControlsWillExitFullscreenAppearance(_:)`](/documentation/AVFoundation/AVCaptureSessionControlsDelegate/sessionControlsWillExitFullscreenAppearance(_:))

Tells the delegate when a capture session’s controls are about to exit a fullscreen appearance.

[`sessionControlsDidBecomeInactive(_:)`](/documentation/AVFoundation/AVCaptureSessionControlsDelegate/sessionControlsDidBecomeInactive(_:))

Tells the delegate when a capture session’s controls become inactive and unavailable for interaction.


---

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