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# activityItemsConfiguration

The custom object from an app built with Mac Catalyst that provides the items to share.

```
var activityItemsConfiguration: (any UIActivityItemsConfigurationReading)? { get set }
```

## Discussion

Use this object to provide the set of items to share from your macOS window.

If this property is `nil`, the item uses the activity items configuration the window scene provides. For more information, see <doc://com.apple.documentation/documentation/UIKit/UIWindowScene/activityItemsConfigurationSource>.

---

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