Enumeration Case


The quality-of-service class for maintenance or cleanup tasks that you create.


case background


Background tasks have the lowest priority of all tasks. Assign this class to tasks or dispatch queues that you use to perform work while your app is running in the background.

See Also

Quality-of-Service Classes

case userInteractive

The quality-of-service class for user-interactive tasks, such as animations, event handling, or updating your app's user interface.

case userInitiated

The quality-of-service class for tasks that prevent the user from actively using your app.

case `default`

The default quality-of-service class.

case utility

The quality-of-service class for tasks that the user does not track actively.

case unspecified

The absence of a quality-of-service class.

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