---
title: NSUndoManagerDidOpenUndoGroup
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsnotification/name-swift.struct/nsundomanagerdidopenundogroup
---

# NSUndoManagerDidOpenUndoGroup

Posted whenever an undo manager opens an undo group.

## Declaration

```swift
static let NSUndoManagerDidOpenUndoGroup: NSNotification.Name
```

## Discussion

Discussion This notification originates in the implementation of the beginUndoGrouping() method. The notification object is the NSUndoManager object. This notification doesn’t contain a userInfo dictionary. The system posts this notification on the actor, thread, or dispatch queue that calls beginUndoGrouping().

## See Also

### Working with notifications

- [NSUndoManagerWillUndoChange](foundation/nsnotification/name-swift.struct/nsundomanagerwillundochange.md)
- [NSUndoManagerDidUndoChange](foundation/nsnotification/name-swift.struct/nsundomanagerdidundochange.md)
- [NSUndoManagerWillRedoChange](foundation/nsnotification/name-swift.struct/nsundomanagerwillredochange.md)
- [NSUndoManagerDidRedoChange](foundation/nsnotification/name-swift.struct/nsundomanagerdidredochange.md)
- [NSUndoManagerCheckpoint](foundation/nsnotification/name-swift.struct/nsundomanagercheckpoint.md)
- [NSUndoManagerWillCloseUndoGroup](foundation/nsnotification/name-swift.struct/nsundomanagerwillcloseundogroup.md)
- [NSUndoManagerDidCloseUndoGroup](foundation/nsnotification/name-swift.struct/nsundomanagerdidcloseundogroup.md)
- [NSUndoManagerGroupIsDiscardableKey](foundation/nsundomanagergroupisdiscardablekey.md)