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# wasInterruptedNotification

A notification the system posts when it interrupts a capture session.

```
class let wasInterruptedNotification: NSNotification.Name
```

## Discussion

Retrieve the underlying error from the notification’s user information dictionary using the key [`AVCaptureSessionInterruptionReasonKey`](/documentation/AVFoundation/AVCaptureSessionInterruptionReasonKey).

## Topics

### User-infomation keys

[`AVCaptureSessionInterruptionSystemPressureStateKey`](/documentation/AVFoundation/AVCaptureSessionInterruptionSystemPressureStateKey)

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

[`AVCaptureSessionInterruptionReasonKey`](/documentation/AVFoundation/AVCaptureSessionInterruptionReasonKey)

Key to retrieve information about a capture interruption from a [`wasInterruptedNotification`](/documentation/AVFoundation/AVCaptureSession/wasInterruptedNotification) user info dictionary.

[`AVCaptureSession.InterruptionReason`](/documentation/AVFoundation/AVCaptureSession/InterruptionReason)

Constants identifying the reason a capture session was interrupted, found in an [`wasInterruptedNotification`](/documentation/AVFoundation/AVCaptureSession/wasInterruptedNotification) user info dictionary.


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