Flutter -如何将focusNode从父部件设置为子部件？

class ParentWidget extends StatelessWidget {
  final FocusNode focusNode = FocusNode();

  @override
  Widget build(BuildContext context) {
    return ChildWidget(focusNode: focusNode);
  }
}

class ChildWidget extends StatelessWidget {
  final FocusNode focusNode;

  ChildWidget({required this.focusNode});

  @override
  Widget build(BuildContext context) {
    return TextField(
      focusNode: focusNode,
      decoration: InputDecoration(
        labelText: 'Enter text',
      ),
    );
  }
}