Stops the observer object from receiving change notifications for the property specified by the key path relative to the object receiving this message.
- iOS 2.0+
- macOS 10.3+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
The object to remove as an observer.
A key-path, relative to the object receiving this message, for which
observeris registered to receive KVO change notifications.