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我正在为我的 Flutter 应用程序设置身份验证流程，并且在模拟器中一切正常。SignUp 运行良好，SignOut 也运行良好。尽管在模拟器中工作，flutter 在尝试注销时会抛出 NoSuchMethod 错误。

我的注销屏幕

class Logout extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: ReusableCard(
          margin: EdgeInsets.all(20.0),
          cardChild: Padding(
            padding: EdgeInsets.all(100.0),
            child: ReusableCard(
              cardChild: Text('Log out'),
              hexcolor: Colors.blueAccent,
              onPress: () async {
                await AuthService().signOut();
                Navigator.pushNamedAndRemoveUntil(
                    context, '/registration', (route) => false);
              },
            ),
          ),
        ),
      ),
    );
  }
}

注册相关代码

 void initState() {
    super.initState();
    auth.getUser.then(
      (user) {
        if (user != null) {
          Navigator.pushReplacementNamed(context, '/proddy');
        }
      },
    );
  }

                    FlatButton(
                      child: Text('Sign Up'),
                      onPressed: () async {
                        emailValid = validator.email(email);
                        passwordValid = validator.password(password);
                        if (emailValid == true && passwordValid == true) {
                          FirebaseUser user = await auth.createUserWithEmail(
                            email: email,
                            password: password,
                          );

                          if (user != null) {
                            await auth.updateUserData(user);
                            Navigator.pushReplacementNamed(context, '/start');
                          }
                        } else {
                          print('Your credentials are invalid');
                        }
                      },
                      color: Colors.greenAccent,
                      shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(20.0)),
                    ),

错误信息

flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY 
flutter: The following NoSuchMethodError was thrown building Start(dirty, dependencies: [MediaQuery,
flutter: InheritedProvider<FirebaseUser>]):
flutter: The getter 'uid' was called on null.
flutter: Receiver: null
flutter: Tried calling: uid

与错误有关的代码

class Start extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    String uid = Provider.of<FirebaseUser>(context).uid;
    SizeConfig().init(context);

    return MultiProvider(
      providers: [
        StreamProvider<GeneralInformation>.value(
          value: Database().generalDataStream(
            uid,
          ),
        ),

感谢您提供任何帮助！我真的很感激，因为我几乎被困在这里:)

4

1 回答 1

1

尝试使用 auth 而不是 AuthService() 因为 auth 是 FirebaseAuth 的实例，您应该从中注销。FirebaseAuth 身份验证 = FirebaseAuth.instance；

onPress: () async {
   await auth.signOut();
   Navigator.pushNamedAndRemoveUntil(
   context, '/registration', (route) => false);
},
于 2019-07-19T12:56:49.980 回答