Determines whether or not a given key has been imposed on the user.
- iOS 2.0+
- macOS 10.2+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The key you are querying.
true if value of the key cannot be changed by the user, otherwise
In cases where machines and/or users are under some kind of management, you should use this function to determine whether or not to disable UI elements corresponding to those preference keys.