Flutter 导航键 + GlobalKey : "method ' pushedName' was called on null"

Question

我找到了 "GlobalKey NavigatorState" solution for middleware here但无法克服错误“方法 'pushedNamed' 被调用为 null”。然后我找到了这个 alternative solution to fix the issue使用单独的类和静态变量，但它产生了相同的错误。 我真正需要的只是一个非常基本的例子 设置以及如何在其他地方调用“pushedNamed”函数。

当前代码

在单独的文件夹中初始化 GlobalKey:

class NavKey{
  static final navKey = new GlobalKey<NavigatorState>();
}

主要.dart:

import 'package:eumag/assets/tools/route_navigation_constants.dart';

    ...

  @override
  Widget build(BuildContext context) {
    return StoreProvider<AppState>(
      store: store,
      child: MaterialApp(
        theme: ThemeData.dark(),
        navigatorKey: NavKey.navKey,
        routes: <String, WidgetBuilder>{
          ROUTE_LOGIN_PAGE: (BuildContext context) => LoginPage(store),
          ROUTE_MAIN_PAGE: (BuildContext context) => MainPage(store),
        },
        home: StoreBuilder<AppState>(
          builder: (BuildContext context, Store<AppState> store) =>
              LoginPage(store),
        ),
      ),
    );
  }

中间件.dart:

import 'package:eumag/assets/tools/route_navigation_constants.dart';

void appStateMiddleware (Store<AppState> store, action, NextDispatcher next) async{

  final navigatorKey = NavKey.navKey;

  if (action is UpdateRoomStatus){
    navigatorKey.currentState.pushNamed(ROUTE_MAIN_PAGE);
    store.dispatch(createSocketConnection);
  }
  next(action);
}

Answer 1

有同样的问题，文档中的最后一行似乎给出了修复的提示。

navigatorKey property

你显然不能使用 routes与 navigatorKey并且必须使用 onGenerateRoute .