使用MaterialApp Builder在屏幕上有一个公共脚手架，但导航时不在AppBar中显示后退按钮

Question

我试图使用MaterialApp Builder在屏幕上有一个公共脚手架，但back按钮在导航上不显示在AppBar中。我是个初来乍到的人。任何理解原因/修复原因的方向都将有所帮助。

材料应用程序小部件

class MyApp extends StatefulWidget {
  // This widget is the root of your application.
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final AppRouter _appRouter = AppRouter();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: APP_TITLE,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      builder: (context, child) => Scaffold(
        appBar: AppBar(
          title: Text(APP_TITLE),
        ),
        body: child,
      ),
      onGenerateRoute: _appRouter.onGenerateRoute,
    );
  }

  @override
  void dispose() {
    _appRouter.dispose();
    super.dispose();
  }
}

主屏幕

class _HomeScreenState extends State<HomeScreen> {
  int _counter = 0;

  @override
  Widget build(BuildContext context) {
    return Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
           Text(
              'My Home Screen',
            ),
            ElevatedButton(
              child: Text("Navigate Back Here"),
              onPressed: () {
                Navigator.of(context).pushNamed('/');
              },
            ),
          ],
        ),
      );
  }
}

Answer 1

我想你不能按下主路由，你可以使用一个后退按钮：navigator.of（context）.push（MaterialPageRoute（builder：(_)=>secondscreen()))；

flutter中默认为home route定义了“/”路由，所以如果您想定义命名的路由，请使用其他内容来表示ex:'secondscreen/'