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.


Validating user interface items

func validateUserInterfaceItem(NSValidatedUserInterfaceItem)

Returns a Boolean value that indicates whether the sender should be enabled.