Question

我在演示项目中使用下面的路线

 routes: <String, WidgetBuilder>{
    '/HomePage': (BuildContext context) => HomePage()
  },

并尝试使用以下代码导航主屏幕

onPressed: () {
    debugPrint("Hello button is clicked");

     Navigator.of(context)
               .pushReplacementNamed('/HomePage');
 },

但是，当我单击按钮时，我得到了异常

════════ Exception caught by gesture ═══════════════════════════════════════════════════════════════
The following assertion was thrown while handling a gesture:
Could not find a generator for route RouteSettings("/HomePage", null) in the _WidgetsAppState.

Generators for routes are searched for in the following order:
 1. For the "/" route, the "home" property, if non-null, is used.
 2. Otherwise, the "routes" table is used, if it has an entry for the route.
 3. Otherwise, onGenerateRoute is called. It should return a non-null value for any valid route not handled by "home" and "routes".
 4. Finally if all else fails onUnknownRoute is called.
Unfortunately, onUnknownRoute was not set.
When the exception was thrown, this was the stack: 
#0      _WidgetsAppState._onUnknownRoute.<anonymous closure> (package:flutter/src/widgets/app.dart:772:9)
#1      _WidgetsAppState._onUnknownRoute (package:flutter/src/widgets/app.dart:785:6)
#2      NavigatorState._routeNamed (package:flutter/src/widgets/navigator.dart:1625:22)
#3      NavigatorState.pushReplacementNamed (package:flutter/src/widgets/navigator.dart:1690:35)
#4      _RegisterPage.build.<anonymous closure> (package:oricon/register.dart:231:42)

我已经检查了下面的堆栈溢出链接

如果需要更多信息，请告诉我。提前致谢。您的努力将不胜感激。

Answer 1

您可以使用代替：

Navigator.of(context)
           .pushReplacementNamed('/HomePage');

使用此：

 Navigator.push(context, new MaterialPageRoute(
   builder: (context) => new MyHomePage())
 );

正如您在此answer中所看到的，这对我有用

Answer 2

您是否正在实现接收路径的主类？

这是一个例子：

void main() => runApp(MyApp()); //as you can see here, it is the main widget

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'MyApp',
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: MyHomePage(title: 'Home Page'),
      routes: {
        'profile': (context) => ProfilePage(),
         /*Here's where you receive your routes, and it is also the main widget*/
      },
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

此外，我必须补充一点，您的问题帮助我发现了我的代码出了什么问题。谢谢！！！

Flutter：在_WidgetsAppState中找不到路由RouteSettings（“ / HomePage”，null）的生成器

2 个答案: