# detectValuesForPatterns:completionHandler: Determines whether the first pasteboard item matches the specified patterns, reading the contents if it finds a match. ``` - (void) detectValuesForPatterns:(NSSet *) patterns completionHandler:(void (^)(NSDictionary *, 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 takes a `Result` parameter that contains either a dictionary with the patterns found on the pasteboard or an error if detection failed. If the `Result` instance contains a dictionary, the keys specify the matched pattern, and the value specifies the content of the pasteboard. ## Discussion > Important: > Calling this method notifies the user that the app has read the contents of the pasteboard. For details about the types returned for each pattern, see [`UIPasteboard.DetectionPattern`](/documentation/UIKit/UIPasteboard/DetectionPattern). --- 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)