Question

我对 firebase 和 flutter 有这种非常奇怪的行为。

我的目标是在用户登录时显示一个屏幕，并在他们可以登录的地方显示一个不同的屏幕。

见下面我的主要功能

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(ProviderScope(child: MyApp()));
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return ScreenUtilInit(
      designSize: Size(360, 690),
      allowFontScaling: false,
      builder: () => MaterialApp(
        debugShowCheckedModeBanner: false,
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.red,
        ),
        home: StreamBuilder(
            stream: FirebaseAuth.instance.userChanges(),
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.active) {
                return FirebaseAuth.instance.currentUser == null
                    ? StartupPage()
                    : AppHome();
              }
              return Text("");
            }),
      ),
    );
  }
}

登录界面：

class LoginPage extends HookWidget {
  final GlobalKey<FormState> _key = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    final _emailController =
        useTextEditingController.fromValue(TextEditingValue.empty);
    final _passwordController =
        useTextEditingController.fromValue(TextEditingValue.empty);

    return Scaffold(
      backgroundColor: Color(0xFFA46EE2),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Container(
            child: Image.asset(
              "assets/images/LOGO.png",
              height: 60.h,
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: Form(
              key: _key,
              child: Column(
                children: [
                  Text(
                    "Welcome back!",
                    style: primaryHeadline,
                  ),
                  Padding(
                    padding: const EdgeInsets.all(1.0),
                    child: CustomTextField(
                      hintText: "Email",
                      secured: false,
                      isEmail: false,
                      onSave: (data) {},
                      onValidate: (value) => validator(value, "Email"),
                      controller: _emailController,
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(1.0),
                    child: CustomTextField(
                      hintText: "Password",
                      secured: true,
                      isEmail: false,
                      onSave: (data) {},
                      onValidate: (value) => validator(value, "Password"),
                      controller: _passwordController,
                    ),
                  ),
                  SizedBox(height: 10),
                  InkWell(
                    onTap: () async {
                      if (_key.currentState.validate()) {
                        await FirebaseAuth.instance.signInWithEmailAndPassword(
                          email: _emailController.text,
                          password: _passwordController.text,
                        );

                        // Navigator.of(context).pushReplacement(
                        //   MaterialPageRoute(
                        //     fullscreenDialog: true,
                        //     builder: (context) => AppHome(),
                        //   ),
                        // );
                      }
                    },
                    child: Container(
                      height: 40.h,
                      decoration: BoxDecoration(
                          color: defaultBackgroundColor,
                          borderRadius: BorderRadius.circular(defaultRadius)),
                      alignment: Alignment.center,
                      child: Text(
                        'Log in',
                        style: defaultWhiteText,
                      ),
                    ),
                  )
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

注册界面

class RegisterPage extends HookWidget {
  final GlobalKey<FormState> _key = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    final _emailController =
        useTextEditingController.fromValue(TextEditingValue.empty);
    final _passwordController =
        useTextEditingController.fromValue(TextEditingValue.empty);

    return Scaffold(
      backgroundColor: Color(0xFFF5EFFC),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Container(
            child: Image.asset(
              "assets/images/ELEMENT_02.png",
              height: 60.h,
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: Form(
              key: _key,
              child: Column(
                children: [
                  Padding(
                    padding: const EdgeInsets.all(1.0),
                    child: CustomTextField(
                      hintText: "Email",
                      secured: false,
                      isEmail: false,
                      onSave: (data) {},
                      onValidate: (value) => validator(value, "Email"),
                      controller: _emailController,
                    ),
                  ),
                  Padding(
                    padding: const EdgeInsets.all(1.0),
                    child: CustomTextField(
                      hintText: "Password",
                      secured: true,
                      isEmail: false,
                      onSave: (data) {},
                      onValidate: (value) => validator(value, "Password"),
                      controller: _passwordController,
                    ),
                  ),
                  SizedBox(height: 10),
                  InkWell(
                    onTap: () async {
                      if (_key.currentState.validate()) {
                        await FirebaseAuth.instance
                            .createUserWithEmailAndPassword(
                          email: _emailController.text,
                          password: _passwordController.text,
                        );
                      }
                    },
                    child: Container(
                      height: 40.h,
                      decoration: BoxDecoration(
                          color: defaultBackgroundColor,
                          borderRadius: BorderRadius.circular(defaultRadius)),
                      alignment: Alignment.center,
                      child: Text(
                        'Signup now',
                        style: defaultWhiteText,
                      ),
                    ),
                  )
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

我有这种行为：

当我使用电子邮件和密码注册，然后退出时，StartupPage 会按预期显示。
当我登录然后退出时，AppHome 没有显示。

我做错了什么？

Answer 1

当您退出时，currentUser 变为 null。

 FirebaseAuth.instance.currentUser == null
                    ? StartupPage()
                    : AppHome();

这将在退出后返回 StartupPage()。所以我猜你的代码运行良好。

如何处理颤振中的用户身份验证状态

1 个答案: