Instance Method


Marks the beginning of an undo group.


- (void)beginUndoGrouping;


All individual undo operations before a subsequent endUndoGrouping message are grouped together and reversed by a later undo message. By default undo groups are begun automatically at the start of the event loop, but you can begin your own undo groups with this method, and nest them within other groups.

This method posts an NSUndoManagerCheckpointNotification unless a top-level undo is in progress. It posts an NSUndoManagerDidOpenUndoGroupNotification if a new group was successfully created.

See Also

Creating Undo Groups

- endUndoGrouping

Marks the end of an undo group.


A Boolean value that indicates whether the receiver automatically creates undo groups around each pass of the run loop.


The number of nested undo groups (or redo groups, if Redo was invoked last) in the current event loop.