如果我使用带有home属性的material应用程序，如何使用导航器在flutter中的屏幕之间导航？

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Navigator(
        initialRoute: '/',
        onGenerateRoute: (RouteSettings settings) {
          WidgetBuilder builder;
          switch (settings.name) {
            case '/':
              builder = (BuildContext context) => HomeScreen();
              break;
            case '/second':
              builder = (BuildContext context) => SecondScreen();
              break;
            // 添加更多的路由
          }
          return MaterialPageRoute(builder: builder, settings: settings);
        },
      ),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: RaisedButton(
        child: Text('Go to Second Screen'),
        onPressed: () {
          Navigator.pushNamed(context, '/second');
        },
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Second Screen'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go back'),
          onPressed: () {
            Navigator.pop(context);
          },
        ),
      ),
    );
  }
}