undoManager property

Implementation

NSUndoManager? get undoManager {
  objc.checkOsVersionInternal('UIResponder.undoManager', iOS: (false, (3, 0, 0)));
  final _ret = _objc_msgSend_151sglz(this.ref.pointer, _sel_undoManager);
  return _ret.address == 0 ? null : NSUndoManager.castFromPointer(_ret, retain: true, release: true);
}