如何在颤动中忽略无效的命名路由？

Question

我有一个MateriallApp 有几个路由和onGenerateRoute 回调。当我在Navigator.pushNamed 中推送无效路由时，它会抛出一个错误提示

Unhandled Exception: Could not find a generator for route RouteSettings("/path", null) in the _WidgetsAppState.
E/flutter ( 2342): Make sure your root app widget has provided a way to generate
E/flutter ( 2342): this route.
E/flutter ( 2342): Generators for routes are searched for in the following order:
E/flutter ( 2342):  1. For the "/" route, the "home" property, if non-null, is used.
E/flutter ( 2342):  2. Otherwise, the "routes" table is used, if it has an entry for the route.
E/flutter ( 2342):  3. Otherwise, onGenerateRoute is called. It should return a non-null value for any valid route not handled by "home" and "routes".
E/flutter ( 2342):  4. Finally if all else fails onUnknownRoute is called.
E/flutter ( 2342): Unfortunately, onUnknownRoute was not set.

在我设置onUnknownRoute 回调后，它说：

When the _WidgetsAppState requested the route RouteSettings("/path", null) from its onUnknownRoute callback, the callback returned null. Such callbacks must never return null.

但如果路线无效，我不想在任何地方导航（因此用户停留在同一屏幕上）。

问题来了：如何忽略损坏的路线？有什么方法可以在MaterialApp 级别进行设置吗？

Answer 1

这很疯狂，但是如果您只是执行以下操作会怎样：

onUnknownRoute: (settings) {
  return MaterialPageRoute<void>(
    settings: settings,
    builder: (BuildContext context) {
        Navigator.pop(context);
        return Scaffold(body: Center(child: Text('Not Found'))); // This should never really be seen.
    },
  );
},

你会留下一个丑陋的屏幕过渡效果，但除非我们在调用 pushNamed 时简单地阻止导航（绝对是我推荐的，但我想你有你的理由），这看起来像另一种选择。