The quality-of-service class for user-interactive tasks, such as animations, event handling, or updating your app's user interface.
- iOS 8.0+
- macOS 10.10+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Xcode 6.0.1+
User-interactive tasks have the highest priority on the system. Use this class for tasks or queues that interact with the user or actively update your app's user interface. For example, use this for class for animations or for tracking events interactively.
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