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AppKit Framework Reference NSUserInterfaceValidations Protocol Reference

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NSUserInterfaceValidations

The NSUserInterfaceValidations protocol works with the NSValidatedUserInterfaceItem protocol to allow the target of a user interface element such as a menu item or a toolbar item to decide whether or not the user interface element should be enabled.

Your custom classes should adopt this protocol if an instance may be the target of a user interface element and need to conditionally enable or disable the element based on the current state of the instance. For more details, read User Interface Validation.