问如何转换Widget？到Widget

EN

/// Get the parent widget in the subtree
class ContextRoute extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Context test"),
      ),
      body: Container(
        child: Builder(builder: (context) {
          // Find the nearest parent up in the Widget tree `Scaffold` widget
          Scaffold? scaffold = context.findAncestorWidgetOfExactType<Scaffold>();
          // Return the title of AppBar directly, here is actually Text ("Context test")
          Widget? widget1 = (scaffold!.appBar as AppBar).title;
          return widget1;
        }),
      ),
    );
  }
}