# init(supportedTypes:validator:payloadAction:) Creates a Paste button that accepts specific types of data from the pasteboard, performing a custom validation of the data before sending it to your app. ``` nonisolated init(supportedTypes: [String], validator: @escaping ([NSItemProvider]) -> Payload?, payloadAction: @escaping (Payload) -> Void) ``` ## Parameters `supportedTypes` The exact uniform type identifiers supported by the button. If the pasteboard doesn’t contain any of the supported types, the button becomes disabled. `validator` A handler that receives those contents of the pasteboard that conform to `payloadAction`. Load and inspect these items to determine whether to validate the button. If you load a valid item, return it from this closure. If the pasteboard doesn’t contain any valid items, return `nil` to invalidate the button. `payloadAction` The handler called when the user clicks the button. This closure receives the preprocessed result of `validator`. ## Discussion Set the contents of `supportedTypes` in order of your app’s preference for its supported types. The Paste button takes the most-preferred type that the pasteboard source supports and delivers this to the `validator` closure. --- 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)