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# 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.

```
func redo()
```

## Discussion

Raises an [`internalInconsistencyException`](/documentation/Foundation/NSExceptionName/internalInconsistencyException) if the method is invoked during an undo operation.

This method posts an [`NSUndoManagerCheckpoint`](/documentation/Foundation/NSNotification/Name-swift.struct/NSUndoManagerCheckpoint) and [`NSUndoManagerWillRedoChange`](/documentation/Foundation/NSNotification/Name-swift.struct/NSUndoManagerWillRedoChange) before it performs the redo operation, and it posts the [`NSUndoManagerDidRedoChange`](/documentation/Foundation/NSNotification/Name-swift.struct/NSUndoManagerDidRedoChange) after it performs the redo operation.

## See Also

[`-  registerUndoWithTarget:selector:object:`](/documentation/Foundation/UndoManager/registerUndo(withTarget:selector:object:))

Registers the selector of the specified target to implement a single undo operation that the target receives.


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