# registerGroupActivity(preparationHandler:) Registers a group activity instance asynchronously with the specified options. ``` @nonobjc func registerGroupActivity(preparationHandler: @escaping () async throws -> ActivityType) where ActivityType : GroupActivity ``` ## Parameters `preparationHandler` The handler the service invokes when it registers the `GroupActivity`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)