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# detectValues(for:inItemSet:completionHandler:)

Determines whether pasteboard items match the specified patterns, reading the contents if it finds a match.

```
func detectValues(for patterns: Set<UIPasteboard.DetectionPattern>, inItemSet itemSet: IndexSet?, completionHandler: @escaping (Result<[[UIPasteboard.DetectionPattern : Any]], any Error>) -> ())
```

## Parameters

`patterns`

The patterns to detect on the pasteboard.

`itemSet`

An index set with each integer value identifying a pasteboard item positionally in the pasteboard. Pass in nil to request all pasteboard items.

`completionHandler`

A closure that the system invokes after detecting patterns on the pasteboard. The closure receives a `Result` instance that contains either an array of dictionaries with the patterns and the associated values found on the pasteboard or an error if detection failed. If `Result` contains an array, the index of each element in the array corresponds to the pasteboard item index specified in `itemSet`.

## 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).

---

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