firebase - Firebase:注销停留在加载后登录

Question

我使用Firebase身份验证，当我登录或注册时，它可以正常工作，并将我提升到主页，但是当我注销时，它成功注销了我
但是当我再次登录时，它停留在加载屏幕上

我的应用程序流程是:main-> Wrapper-> Authenticate-> Login / Register-> Home

这是包装器:

class _WrapperState extends State<Wrapper> {
  int _currentTab = 1;

  final _page = [
    Search(),
    Home(),
    Account(),
  ];

  @override
  Widget build(BuildContext context) {
    final user = Provider.of<User>(context);
    print(user.uid);

    if (user == null) {
      return Authenticate();
    } else {
      return
//        Home();
       }
}

这是登录名:

RaisedButton(
                color: Colors.green[400],
                child: Text(
                  'دخول',
                  style: TextStyle(color: Colors.white),
                ),
                onPressed: () async {
                  if(_formKey.currentState.validate()){
                    setState(() => loading = true);
                    dynamic result = await _auth.signInWithEmailAndPassword(email, password);
                    if(result == null) {
                      setState(() {
                        loading = false;
                        error = 'Could not sign in with those credentials';
                      });
                    }
                  }
                }
            ),

这是FirebasE的signIn方法实现:

Future signInWithEmailAndPassword(String email, String password) async {
    try {
      AuthResult result = await _auth.signInWithEmailAndPassword(email: email, password: password);
      FirebaseUser user = result.user;
      return user;
    } catch (error) {
      print(error.toString());
      return null;
    }
  }

Answer 1

由于您有两个setState，因此卡在加载中，每当您按下按钮时，第一个setState就会被调用，并将true赋给变量loading。您应该将其更改为以下内容:

onPressed: () async {
                  if(_formKey.currentState.validate()){
                    setState(()async{ 
                       loading = true;
                       dynamic result = await _auth.signInWithEmailAndPassword(email, password);
                    if(result == null) { 
                        loading = false;
                        error = 'Could not sign in with those credentials';
                      });
                    }
                  }
                }