Instance Method


Closes the top-level undo group if necessary and invokes undoNestedGroup().


func undo()


This method also invokes endUndoGrouping() if the nesting level is 1. Raises an NSInternalInconsistencyException if more than one undo group is open (that is, if the last group isn’t at the top level).

This method posts an NSUndoManagerCheckpoint.

See Also

Performing Undo and Redo

func undoNestedGroup()

Performs the undo operations in the last undo group (whether top-level or nested), recording the operations on the redo stack as a single group.

func redo()

Performs the operations in the last group on the redo stack, if there are any, recording them on the undo stack as a single group.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software