Question

我是 Flutter 新手，我的任务是将路径分为公共路径和私有路径。对于解决方案，我使用了 Dima Rostopira 的建议建议，于 20 年 7 月 28 日 8:29 在此topic

我的主要问题是，而不是 example 中显示的：

<块引用>

MyAuth.isUserLoggedIn

我需要使用异步函数：

<块引用>

Auth().isAuth()

但 example 解决方案不适用于异步函数。

有人可以帮忙解决这个问题吗？

ConditionalRouter.dart

class ConditionalRouter extends MapMixin<String, WidgetBuilder> {
  final Map<String, WidgetBuilder> public;
  final Map<String, WidgetBuilder> private;

  ConditionalRouter({this.public, this.private});
  
  @override
  WidgetBuilder operator [](Object key) {
    if (public.containsKey(key)) return public[key];
    if (private.containsKey(key)) {
      if (Auth().isAuth()) {          //PROBLEM IS HERE, BECAUSE Auth().isAuth() IS ASYNC
        return private[key];
      }
      return (context) => AuthScreen();
    }
    return null;
  }

  @override
  void operator []=(key, value) {}

  @override
  void clear() {}

  @override
  Iterable<String> get keys {
    final set = Set<String>();
    set.addAll(public.keys);
    set.addAll(private.keys);
    return set;
  }

  @override
  WidgetBuilder remove(Object key) {
    return public[key] ?? private[key];
  }
}

NavigationRoutes.dart

class NavigationRoutes {
  static const agreementsScreen = "/agreementsScreen";
  static const documentsScreen = "/documentsScreen";

  var routes = ConditionalRouter(
      public: {
    DocumentsScreen.routeName: (context) => DocumentsScreen()
      }, 
      private: {
    AgreementsScreen.routeName: (context) => AgreementsScreen(),
  });
}

Auth.dart

  Future<bool> isAuth() async {
    print('Checking AUTH with isAuth()');
    bool isAlreadyLogin = false;

    /*
      ...
      asynchronous logic, that check is user authenticated or active session or not
      ...
     */

    return isAlreadyLogin; 
 }

main.dart 例如，路由器如何在 main.dart 中调用

MaterialApp(
       title: 'Main App',
       routes: NavigationRoutes().routes
  ),

Flutter 中的私有和公共路由器

0 个答案: