# detectPatternsForPatterns:completionHandler: Determines whether the first pasteboard item matches the specified patterns, without notifying the user. ``` - (void) detectPatternsForPatterns:(NSSet *) patterns completionHandler:(void (^)(NSSet *, NSError *)) completionHandler; ``` ## Parameters `patterns` The patterns to detect on the pasteboard. `completionHandler` A block that the system invokes after detecting patterns on the pasteboard. The block receives a `Result` instance that contains either a set with the patterns found on the pasteboard or an error if detection failed. ## Discussion Because this method only gives an indication of whether a pasteboard item matches a particular pattern and doesn’t allow the app to access the contents, the system doesn’t notify the user about reading the contents of the pasteboard. --- 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)