我应该如何在Flutter中实现片段之间的导航？

Navigator _navigator;

@override
Widget build(BuildContext context) {
  _navigator = Navigator(
    onGenerateRoute: (RouteSettings settings) {
      return MaterialPageRoute(
        builder: (BuildContext context) {
          // 根据settings中的参数构建对应的页面
          return buildPage(settings);
        },
      );
    },
  );

  return Scaffold(
    appBar: AppBar(
      title: Text('Flutter Navigation'),
    ),
    body: _navigator,
  );
}

Widget buildPage(RouteSettings settings) {
  // 根据settings中的参数构建对应的页面
  if (settings.name == '/page1') {
    return Page1();
  } else if (settings.name == '/page2') {
    return Page2();
  } else {
    return Container();
  }
}

Navigator.pushNamed(context, '/page1');

Navigator.pop(context);