持久化登入逻辑

lib/pages/home_page.dart

@@ -1,17 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:flutterchat/components/user_tile.dart';
 import 'package:flutterchat/pages/chat_page.dart';
-import 'package:flutterchat/service/auth/auth_service.dart';
 import 'package:flutterchat/service/chat/chat_service.dart';
 
 class HomePage extends StatelessWidget {
-  HomePage({super.key});
+  HomePage({super.key, required this.signOut});
   final ChatService _chatService = ChatService();
 
-  void logout() {
-    final AuthService authService = AuthService();
-    authService.signOut();
-  }
+  final VoidCallback signOut;
 
   @override
   Widget build(BuildContext context) {
@@ -25,7 +21,7 @@ class HomePage extends StatelessWidget {
           //登出按钮
           IconButton(
             icon: const Icon(Icons.logout),
-            onPressed: logout,
+            onPressed: signOut,
           ),
         ],
       ),

lib/service/auth/auth_gate.dart

@@ -1,29 +1,69 @@
-import 'package:flutter/material.dart'; // 导入Flutter的Material库
-import 'package:flutterchat/service/auth/login_or_register.dart'; // 导入自定义的登录或注册页面
-import 'package:flutterchat/pages/home_page.dart'; // 导入自定义的主页
-import 'package:supabase_flutter/supabase_flutter.dart'; // 导入Supabase的Flutter库
+import 'package:flutter/material.dart';
+import 'package:flutterchat/pages/home_page.dart';
+import 'package:flutterchat/service/auth/login_or_register.dart';
+import 'package:supabase_flutter/supabase_flutter.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
-// 定义一个无状态组件AuthGate
-class AuthGate extends StatelessWidget {
-  const AuthGate({super.key}); // 构造函数，接收一个可选的key参数
+class AuthGate extends StatefulWidget {
+  const AuthGate({super.key});
+
+  @override
+  AuthGateState createState() => AuthGateState();
+}
+
+class AuthGateState extends State<AuthGate> {
+  bool _isLoggedIn = false; // 用于存储用户是否已登录的状态
+
+  @override
+  void initState() {
+    super.initState();
+    _checkLoginStatus(); // 初始化时检查登录状态
+  }
+
+  // 检查用户的登录状态并保存登录状态
+  Future<void> _checkLoginStatus() async {
+    SharedPreferences prefs =
+        await SharedPreferences.getInstance(); // 获取SharedPreferences实例
+    setState(() {
+      _isLoggedIn =
+          prefs.getBool('isLoggedIn') ?? false; // 获取存储的登录状态，如果没有则默认为false
+    });
+
+    if (_isLoggedIn) {
+      final user = Supabase.instance.client.auth.currentUser; // 获取当前Supabase用户
+      if (user == null) {
+        setState(() {
+          _isLoggedIn = false; // 如果Supabase中没有用户信息，则更新状态为未登录
+          prefs.setBool('isLoggedIn', false); // 同时更新SharedPreferences中的登录状态
+        });
+      }
+    }
+  }
+
+  // 用户登出的方法
+  Future<void> _signOut() async {
+    await Supabase.instance.client.auth.signOut(); // 调用Supabase的signOut方法
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    prefs.setBool('isLoggedIn', false); // 更新SharedPreferences中的登录状态为未登录
+    setState(() {
+      _isLoggedIn = false; // 更新组件状态
+    });
+  }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      // 返回一个Scaffold小部件
       body: StreamBuilder<AuthState>(
-        // 使用StreamBuilder监听认证状态的变化
-        stream: Supabase.instance.client.auth.onAuthStateChange,
+        stream: Supabase.instance.client.auth.onAuthStateChange, // 监听认证状态变化的流
         builder: (context, snapshot) {
-          // 构建UI
-          // 如果用户已登录
           if (snapshot.hasData &&
               snapshot.data!.event == AuthChangeEvent.signedIn) {
-            return HomePage(); // 返回主页
-          }
-
-          // 如果用户未登录
-          else {
+            SharedPreferences.getInstance().then(
+                (prefs) => prefs.setBool('isLoggedIn', true)); // 如果用户已登录，保存登录状态
+            return HomePage(signOut: _signOut); // 返回主页，并传递登出方法
+          } else {
+            SharedPreferences.getInstance().then((prefs) =>
+                prefs.setBool('isLoggedIn', false)); // 如果用户未登录，保存未登录状态
             return const LoginOrRegister(); // 返回登录或注册页面
           }
         },

pubspec.lock

@@ -345,13 +345,13 @@ packages:
     source: hosted
     version: "0.27.7"
   shared_preferences:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: shared_preferences
-      sha256: c3f888ba2d659f3e75f4686112cc1e71f46177f74452d40d8307edc332296ead
+      sha256: c272f9cabca5a81adc9b0894381e9c1def363e980f960fa903c604c471b22f68
       url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
     source: hosted
-    version: "2.3.0"
+    version: "2.3.1"
   shared_preferences_android:
     dependency: transitive
     description:

pubspec.yaml

@@ -10,6 +10,7 @@ dependencies:
   flutter:
     sdk: flutter
   supabase_flutter: ^2.5.11
+  shared_preferences: ^2.3.1
 
 dev_dependencies:
   flutter_test: