Prepares the undo manager for invocation-based undo with the given target as the subject of the next undo operation.
- iOS 3.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
The target of the undo operation.
The undo manager maintains a weak reference to
A proxy object that forwards messages to the undo manager for recording as undo actions.