# init(preparationHandler:) Initializes the SharePlay sharing controller with a closure that creates the activity object. ``` @MainActor init(preparationHandler: @escaping () async throws -> ActivityType) where ActivityType : GroupActivity ``` ## Parameters `preparationHandler` A closure that takes no parameters and returns the activity object. ## Discussion The initializer executes the closure asynchronously so that your app can present the view controller in a timely manner. Use this method when the creation of the [`GroupActivity`](/documentation/GroupActivities/GroupActivity) object might take a significant amount of time. --- 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)