Question

我最近开始开发一个闪电灯,使该地区变得更新。因此,我一直在研究如何使用布洛茨。然而,当我反省我的布洛茨和我的服务时,一切都会奏效。在我使用<代码>之前, 供应商。我有两部法典。第一:

return RepositoryProvider<AuthenticationService>(
      create: (context) {
        return FakeAuthenticationService();
      },
      // Injects the Authentication BLoC
      child: BlocProvider<AuthenticationBloc>(
        create: (context) {
          final authService = RepositoryProvider.of<AuthenticationService>(context);
          return AuthenticationBloc(authService)..add(AppLoaded());
        },
        child:  MaterialApp(
          title:  Authentication Demo ,
          theme: appTheme(),
          home: BlocBuilder<AuthenticationBloc, AuthenticationState>(
            builder: (context, state) {
              if (state is AuthenticationAuthenticated) {
                // show home page
                return HomePage(
                  user: state.user,
                );
              }
              // otherwise show login page
              return StartupPage();
            },
          ),
        )
      ),
    );

该法典实行罚款,但第2版则完全相同,但使用<代码>Multi RepositoryProvider的除外。第二部法典:

return MultiRepositoryProvider(
      providers: [
        RepositoryProvider<AuthenticationService>(
          create: (context) => FakeAuthenticationService(),
          child: BlocProvider<AuthenticationBloc>(
            create: (context) {
              final authService = RepositoryProvider.of<AuthenticationService>(context);
              return AuthenticationBloc(authService)..add(AppLoaded());
            },
          ),
        )
      ],
      child: MaterialApp(
        title:  Authentication Demo ,
        theme: appTheme(),
        home: BlocBuilder<AuthenticationBloc, AuthenticationState>(
          builder: (context, state) {
            if (state is AuthenticationAuthenticated) {
              // show home page
              return HomePage(
                user: state.user,
              );
            }
            // otherwise show login page
            return StartupPage();
          },
        ),
      ),
    );

现在,第二部法典给我留下了以下错误:BlocProvider.of() ,其背景并不包含AthenticationBloc类的缩略语。


是否有任何人知道第二部法典为什么不奏效?

Answer 1

我是同一件事,我错了,但现在解决了。

return MultiRepositoryProvider(
    providers: [
      RepositoryProvider<TranslationRepository>(
        create: (context) => TranslationRepository(),
      ),
      RepositoryProvider<WeatherRepository>(
        create: (context) => WeatherRepository(),
      ),
    ],
    child: MultiBlocProvider(
        providers: [
          BlocProvider<WeatherBloc>(
            create: (context) =>
                WeatherBloc(context.read<WeatherRepository>()),
          ),
          BlocProvider<ConnectivityBloc>(
            create: (context) => ConnectivityBloc(),
          ),
          BlocProvider<TranslationBloc>(
            create: (context) =>
                TranslationBloc(context.read<TranslationRepository>()),
          ),
        ],
        child: MaterialApp(
          title:  Material App ,
          onGenerateRoute: router.generateRoute,
          initialRoute:  / ,
        )));

First, in my create function I overrided the context with "_" but I got the same error. Now with this snippet it works perfectly, just put the same context name as my providers before

Answer 2

www.un.org/Depts/DGACM/index_spanish.htm 错误: 不能找到高于这一附录的正确供应商。

我正在发现这一错误,即供应商在目前的道路或环境中找不到。而现在,以下的法典将处以罚款。我作出的唯一改动是,在创建供应商方法时写“文字”而不是“......”:

www.un.org/Depts/DGACM/index_spanish.htm (c) 创建:

www.un.org/Depts/DGACM/index_spanish.htm Correct Code

class AppWrapper extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MultiRepositoryProvider(
      providers: [RepositoryProvider<AuthRepository>(create: (_) => AuthRepository())],
      child: MaterialApp(
        title:  Pokedex App ,
        theme: themeData,
        home: MultiBlocProvider(
          providers: [
            BlocProvider<AuthBloc>(
              create: (_) => AuthBloc(
                authRepository: context.read<AuthRepository>(),
              ),
            ),
            BlocProvider(
              create: (_) => LoginCubit(
                authRepository: context.read<AuthRepository>(),
              ),
            ),
            BlocProvider(
              create: (_) => SignupCubit(
                authRepository: context.read<AuthRepository>(),
              ),
            ),
          ],
          child: SignupScreen(),
        ),
      ),
    );
  }
}

友情链接