didUndoChange
An identifier for a message about an undo manager having performed an undo.
Declaration
static var didUndoChange: NotificationCenter.BaseMessageIdentifier<UndoManager.DidUndoChangeMessage> { get }Discussion
Use this identifier with NotificationCenter’s addObserver(of:for:using:) or messages(of:for:bufferSize:) methods to observe messages of type UndoManager.DidUndoChangeMessage.