firebase - 颤动的firebase注销失败

Question

状态管理太难了。

通过firebase登录正常工作，第一次注销工作正常。

但是，如果您登录并转到另一个屏幕，则无法注销。

什么地方出了错？

• 注销提供程序

'''

Future logout() async {
    await firebaseAuth.signOut();
  }

'''

• 使用注销的页面

'''

Widget build(BuildContext context) {
    final loginProvider = Provider.of<AuthProvider>(context);
    return Scaffold(
        appBar: AppBar(
          actions: [
            IconButton(
              onPressed: () async => await loginProvider.logout(),
              icon: Icon(
                Icons.settings,
                color: Colors.white,
              ),
            )
         
      
        ),

如果我像下面这样修改它，它工作正常。但我不知道这是否是正确的方法。

'''

onPressed: () async => await loginProvider.logout().then(
                  (value) => Navigator.of(context).pushReplacement(
                      MaterialPageRoute(
                          builder: (BuildContext context) => Wrapper()))),

• 登录提供程序

'''

Future login(String email, String password) async {
    setLoading(true);
    try {
      UserCredential authResult = await firebaseAuth.signInWithEmailAndPassword(
          email: email, password: password);
      User? user = authResult.user;
      setLoading(false);
      return user;
    } on SocketException {
      setMessage('No internet');
    } catch (e) {
      setLoading(false);
      setMessage(e.toString());
    }
    notifyListeners();
  }

'''

'''

• 登录屏幕

'''

Container(
                    height: 50.0,
                    margin: EdgeInsets.only(top: 20.0),
                    width: MediaQuery.of(context).size.width * 0.8,
                    child: MaterialButton(
                        color: Color(0xffe50815),
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(10.0),
                        ),
                        onPressed: () async {
                          if (this._formKey.currentState!.validate()) {
                            print('email : ${this.idCt.text}');
                            print('password : ${this.pwCt.text}');
                            await loginProvider.login(
                                this.idCt.text.trim(), this.pwCt.text.trim());
                          }
                        },
                        child: loginProvider.isLoading
                            ? CircularProgressIndicator()
                            : Text("LOGIN",
                                style: new TextStyle(
                                    fontSize: 12.0,
                                    fontWeight: FontWeight.bold,
                                    color: Colors.white))),
                  ),

'''

• 提供者

  class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final _init = Firebase.initializeApp();
    return FutureBuilder(
        future: _init,
        builder: (BuildContext context, snapshot) {
          if (snapshot.hasError) {
            return Column(
              children: [
                Icon(Icons.error),
                Center(
                  child: Text('something went wrong!'),
                ),
              ],
            );
          } else if (snapshot.hasData) {
            return MultiProvider(
              providers: [
                ChangeNotifierProvider<AuthProvider>.value(
                  value: AuthProvider(),
                ),
                StreamProvider<User?>.value(
                  value: AuthProvider().user,
                  initialData: null,
                  catchError: (_, err) => null,
                ),
                ChangeNotifierProvider(
                    create: (BuildContext context) =>
                        MovieNowPlayingProvider()),
                ChangeNotifierProvider(
                    create: (BuildContext context) => TvPopularProvider()),
              ],
              child: MaterialApp(
                debugShowCheckedModeBanner: false,
                home: SplashScreen(),
              ),
            );
          }
          return Container();
        });
  }
  

  }

• 包装器'''

  class Wrapper extends StatelessWidget {
  const Wrapper({Key? key}) : super(key: key);
  
  @override
  Widget build(BuildContext context) {
    final user = Provider.of<User?>(context);
    if (user != null) {
      return MainScreen();
    }
    return Authentication();
  }
  

  }

'''

标签： firebaseflutter

Answer 1

使用.then然后导航到包装器并没有错，但您可能希望将onPressed代码重构为：

    onPressed: () async {
      await loginProvider.logout();
      Navigator.of(context).pushReplacement(
        MaterialPageRoute(
          builder: (BuildContext context) => Wrapper())
      );
    },

由于您正在使用async/await，因此仅使用它而不是将其与.then.