以编程方式返回由父小部件包装的小部件的最佳方法

class ParentWidget extends StatelessWidget {
  final Key childKey = UniqueKey();

  @override
  Widget build(BuildContext context) {
    return Container(
      child: ChildWidget(
        key: childKey,
      ),
    );
  }
}

class ChildWidget extends StatelessWidget {
  final Key key;

  ChildWidget({required this.key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final ParentWidgetState? parentState = context.findAncestorStateOfType<ParentWidgetState>();
    final parentWidget = parentState?.widget as ParentWidget;

    // 通过父小部件的引用获取对应的子小部件对象
    final childWidget = parentWidget.childKey.currentWidget;

    return Container(
      child: Text('Child Widget'),
    );
  }
}