# preferredName(for:basedOn:) Generate a preferred name for the given attachment. ``` borrowing func preferredName(for attachment: borrowing Attachment, basedOn suggestedName: String) -> String ``` ## Parameters `attachment` The attachment that needs to be named. `suggestedName` A suggested name to use as the basis of the preferred name. This string was provided by the developer when they initialized `attachment`. ## Return Value The preferred name for `attachment`. ## Discussion The testing library uses this function to determine the best name to use when saving `attachment`. The default implementation of this function returns `suggestedName` without any changes. --- 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)