The default quality-of-service class.
- iOS 8.0+
- macOS 10.10+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Xcode 6.0.1+
Default tasks have a lower priority than user-initiated and user-interactive tasks, but a higher priority than utility and background tasks. Assign this class to tasks or queues that your app initiates or uses to perform active work on the user's behalf.
The quality-of-service class for user-interactive tasks, such as animations, event handling, or updating your app's user interface.
The quality-of-service class for tasks that prevent the user from actively using your app.
The quality-of-service class for tasks that the user does not track actively.
The quality-of-service class for maintenance or cleanup tasks that you create.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.Learn more about using Apple's beta software