# onAssignedDocumentWillWithdraw(_:) Adds an action to perform before withdrawing an assigned document submission. ``` @MainActor @preconcurrency func onAssignedDocumentWillWithdraw(_ action: @escaping @Sendable (URL) async -> Bool) -> some View ``` ## Parameters `action` An asynchronous closure that receives the document URL and returns a Boolean value indicating whether to proceed. Return `true` to continue, or `false` to cancel. ## Return Value A view that executes the specified action before withdrawing an assigned document. ## Discussion Return `true` to allow the withdrawal to proceed or `false` to cancel it. This action confirms whether the person wants to withdraw their work. ```swift AssignedDocumentSubmissionButton(documentURL: documentURL) .onAssignedDocumentWillWithdraw { url in // Confirm the person's intent let confirmed = await showConfirmation( "Are you sure you want to withdraw your document submission?" ) return confirmed } ``` --- 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)