---
title: AVCaptureSessionInterruptionSystemPressureStateKey
framework: avfoundation
role: symbol
role_heading: Global Variable
path: avfoundation/avcapturesessioninterruptionsystempressurestatekey
---

# AVCaptureSessionInterruptionSystemPressureStateKey

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

## Declaration

```swift
let AVCaptureSessionInterruptionSystemPressureStateKey: String
```

## Discussion

Discussion If an interruption occurs and the value of AVCaptureSessionInterruptionReasonKey equals AVCaptureSession.InterruptionReason.videoDeviceNotAvailableDueToSystemPressure, the userInfo dictionary for the notification contains this key and a corresponding AVCaptureDevice.SystemPressureState value.

## See Also

### Monitoring system pressure

- [systemPressureState](avfoundation/avcapturedevice/systempressurestate-swift.property.md)
- [AVCaptureDevice.SystemPressureState](avfoundation/avcapturedevice/systempressurestate-swift.class.md)