UndoManager.DidRedoChangeMessage
A message that an undo manager sends after redoing a change.
Declaration
struct DidRedoChangeMessageOverview
The undo manager posts this message after you call redo(). Because this is a “did”-style message, the undo manager sends the message after it performs the redo.
Observe this message type with the identifier didRedoChange, or specify its type directly to the addObserver(of:for:using:) method. The Subject of this message type is UndoManager.
This message interoperates with the notification NSUndoManagerDidRedoChange. The system notifies observers of the message when the NotificationCenter posts the notification. Similarly, the system notifies observers of the notification when it posts the message.