# `GSBaseObject.undoManager`

*Instance Property*

The undo manager provided by the parent, or `nil` when none is available.

## Declaration

```swift
var undoManager: UndoManager? { get }
```

```objc
@property (nonatomic, readonly) NSUndoManager * undoManager;
```

```python
undoManager() -> NSUndoManager
```

## See Also

### Change Tracking

- [`GSBaseObject elementDidChange:`](/Core/GlyphsCore/GSBaseObject/elementDidChange:) — Notifies the parent that an element changed.
- [`GSBaseObject.undoManagerCheck`](/Core/GlyphsCore/GSBaseObject/undoManagerCheck) — The undo manager provided by the parent when undo registration is enabled, or `nil` otherwise.