Static AVCaptureSessionInterruptionReasonKey 

pub unsafe static AVCaptureSessionInterruptionReasonKey: &'static NSString

Available on crate feature AVCaptureSession only.

The key used to provide an NSNumber describing the interruption reason in an AVCaptureSessionWasInterruptedNotification.

AVCaptureSessionInterruptionReasonKey may be found in the userInfo dictionary provided with an AVCaptureSessionWasInterruptedNotification. The NSNumber associated with the notification tells you why the interruption occurred.

See also Apple’s documentation