flutter - 返回 Widget 闪屏，flutter-bloc 模式

Question

我是flutter的新手，我只是按照firebase登录flutter-bloc教程为我的应用程序做同样的操作，

一切顺利，除了第一个屏幕加载。

home: BlocBuilder<AuthBloc, AuthState>(
    builder: (context, state) {
      if (state is Uninitialized) { <=== return regardless of the state
        return WelcomeScreen();
      } else if (state is Unauthenticated) { <=== return regardless of the state
        return LoginScreen(userRepository: _userRepository);
      } else if (state is Authenticated) {
        return HomeScreen( <=== return regardless of the state
          user: state.user,
          homeRepository: _homeRepository,
          userRepository: _userRepository,
        );
      }
      return WelcomeScreen();
    },

颤振块 main.dart

if 条件返回每个屏幕而不考虑状态，如果满足状态条件，它应该打破条件并只返回一个小部件。但这里不是这样，它返回的每个屏幕都很奇怪。

谢谢