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# Background task cancellation

Constants that indicate why a background task was canceled.

## Discussion

These values are used in conjunction with the [`NSURLErrorBackgroundTaskCancelledReasonKey`](/documentation/Foundation/NSURLErrorBackgroundTaskCancelledReasonKey) key in an [`NSError`](/documentation/Foundation/NSError) object’s `userInfo` dictionary.

## Topics

### Cancellation reasons

[`var NSURLErrorCancelledReasonBackgroundUpdatesDisabled: Int`](/documentation/Foundation/NSURLErrorCancelledReasonBackgroundUpdatesDisabled)

A reason that indicates the system canceled the background task because background tasks are disabled.

[`var NSURLErrorCancelledReasonInsufficientSystemResources: Int`](/documentation/Foundation/NSURLErrorCancelledReasonInsufficientSystemResources)

A reason that indicates the system canceled the background task because it lacks sufficient resources to perform the task.

[`var NSURLErrorCancelledReasonUserForceQuitApplication: Int`](/documentation/Foundation/NSURLErrorCancelledReasonUserForceQuitApplication)

A reason that indicates the system canceled the background task because the user force-quit the application.


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