Instance Property

hasUndoManager

A Boolean value that indicates whether the document owns an undo manager object.

Declaration

var hasUndoManager: Bool { get set }

Discussion

If you change the value of this property to NO and the document already owns an UndoManager object, the document removes the undo manager as an observer of undo-related notifications and then removes its reference to the object.

See Also

Managing Undo and Redo Actions

var undoManager: UndoManager?

The object that the document uses to support undo/redo operations.