vyuh_feature_auth 是一个用于身份验证的 Flutter 插件，通常用于处理用户登录、注册、会话管理等功能。以下是使用 vyuh_feature_auth 插件的基本步骤和示例代码。

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 vyuh_feature_auth 插件的依赖。

dependencies:
  flutter:
    sdk: flutter
  vyuh_feature_auth: ^1.0.0  # 请使用最新版本

然后运行 flutter pub get 来获取依赖。

2. 初始化插件

在你的 Flutter 应用启动时，初始化 vyuh_feature_auth 插件。

import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // 初始化身份验证插件
  await VyuhAuth.initialize(
    apiKey: 'YOUR_API_KEY',
    authDomain: 'YOUR_AUTH_DOMAIN',
    projectId: 'YOUR_PROJECT_ID',
  );

  runApp(MyApp());
}

3. 用户登录

使用 VyuhAuth 提供的 signInWithEmailAndPassword 方法进行用户登录。

import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

Future<void> loginUser(String email, String password) async {
  try {
    UserCredential userCredential = await VyuhAuth.instance.signInWithEmailAndPassword(
      email: email,
      password: password,
    );
    print('User logged in: ${userCredential.user?.email}');
  } on AuthException catch (e) {
    print('Login failed: ${e.message}');
  }
}

4. 用户注册

使用 VyuhAuth 提供的 createUserWithEmailAndPassword 方法进行用户注册。

import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

Future<void> registerUser(String email, String password) async {
  try {
    UserCredential userCredential = await VyuhAuth.instance.createUserWithEmailAndPassword(
      email: email,
      password: password,
    );
    print('User registered: ${userCredential.user?.email}');
  } on AuthException catch (e) {
    print('Registration failed: ${e.message}');
  }
}

5. 检查用户登录状态

你可以使用 VyuhAuth 提供的 currentUser 属性来检查当前用户是否已登录。

import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

void checkUserLoginStatus() {
  User? user = VyuhAuth.instance.currentUser;
  if (user != null) {
    print('User is logged in: ${user.email}');
  } else {
    print('No user is logged in');
  }
}

6. 用户登出

使用 VyuhAuth 提供的 signOut 方法进行用户登出。

import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

Future<void> logoutUser() async {
  await VyuhAuth.instance.signOut();
  print('User logged out');
}

7. 监听身份验证状态变化

你可以使用 VyuhAuth 提供的 authStateChanges 流来监听用户身份验证状态的变化。

import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

void listenToAuthState() {
  VyuhAuth.instance.authStateChanges().listen((User? user) {
    if (user != null) {
      print('User is logged in: ${user.email}');
    } else {
      print('No user is logged in');
    }
  });
}

8. 完整示例

以下是一个完整的示例，展示了如何使用 vyuh_feature_auth 插件进行用户登录、注册和登出。

import 'package:flutter/material.dart';
import 'package:vyuh_feature_auth/vyuh_feature_auth.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  await VyuhAuth.initialize(
    apiKey: 'YOUR_API_KEY',
    authDomain: 'YOUR_AUTH_DOMAIN',
    projectId: 'YOUR_PROJECT_ID',
  );

  runApp(AuthApp());
}

class AuthApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: AuthScreen(),
    );
  }
}

class AuthScreen extends StatefulWidget {
  [@override](/user/override)
  _AuthScreenState createState() => _AuthScreenState();
}

class _AuthScreenState extends State<AuthScreen> {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();

  [@override](/user/override)
  void initState() {
    super.initState();
    listenToAuthState();
  }

  void listenToAuthState() {
    VyuhAuth.instance.authStateChanges().listen((User? user) {
      if (user != null) {
        print('User is logged in: ${user.email}');
      } else {
        print('No user is logged in');
      }
    });
  }

  Future<void> _login() async {
    await loginUser(_emailController.text, _passwordController.text);
  }

  Future<void> _register() async {
    await registerUser(_emailController.text, _passwordController.text);
  }

  Future<void> _logout() async {
    await logoutUser();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Auth Example'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: _emailController,
              decoration: InputDecoration(labelText: 'Email'),
            ),
            TextField(
              controller: _passwordController,
              decoration: InputDecoration(labelText: 'Password'),
              obscureText: true,
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _login,
              child: Text('Login'),
            ),
            ElevatedButton(
              onPressed: _register,
              child: Text('Register'),
            ),
            ElevatedButton(
              onPressed: _logout,
              child: Text('Logout'),
            ),
          ],
        ),
      ),
    );
  }
}