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# AVCaptureSessionInterruptionSystemPressureStateKey

A key to retrieve a state value that indicates the system pressure level and contributing factors that caused the interruption.

```
let AVCaptureSessionInterruptionSystemPressureStateKey: String
```

## Discussion

If an interruption occurs and the value of [`AVCaptureSessionInterruptionReasonKey`](/documentation/AVFoundation/AVCaptureSessionInterruptionReasonKey) equals [`AVCaptureSession.InterruptionReason.videoDeviceNotAvailableDueToSystemPressure`](/documentation/AVFoundation/AVCaptureSession/InterruptionReason/videoDeviceNotAvailableDueToSystemPressure), the <doc://com.apple.documentation/documentation/Foundation/Notification/userInfo> dictionary for the notification contains this key and a corresponding [`AVCaptureDevice.SystemPressureState`](/documentation/AVFoundation/AVCaptureDevice/SystemPressureState-swift.class) value.

---

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