#1827 微信多开时，取消登陆，页面会一直显示等待中

lib/bloc/login_main_cubit.dart

+import 'dart:async';
 import 'dart:io';
 import 'dart:io';
 
 
 import 'package:appframe/config/constant.dart';
 import 'package:appframe/config/constant.dart';
@@ -69,13 +70,21 @@ class LoginMainState extends Equatable {
       ];
       ];
 }
 }
 
 
-class LoginMainCubit extends Cubit<LoginMainState> {
+class LoginMainCubit extends Cubit<LoginMainState> with WidgetsBindingObserver {
   late final Fluwx _fluwx;
   late final Fluwx _fluwx;
   late final FluwxCancelable _fluwxCancelable;
   late final FluwxCancelable _fluwxCancelable;
   late final WechatAuthRepository _wechatAuthRepository;
   late final WechatAuthRepository _wechatAuthRepository;
   late final UserAuthRepository _userAuthRepository;
   late final UserAuthRepository _userAuthRepository;
 
 
+  // 是否正在等待微信授权回调；用于多微信选择器取消、用户中途返回等异常场景的兜底
+  bool _waitingWechatAuth = false;
+  // 总超时（请求已投递但长时间无任何回调时强制复位）
+  Timer? _wechatAuthTimeoutTimer;
+  // App 回到前台后的短延时（用于判定系统层取消）
+  Timer? _wechatAuthResumeTimer;
+
   LoginMainCubit(super.initialState) {
   LoginMainCubit(super.initialState) {
+    WidgetsBinding.instance.addObserver(this);
     _fluwx = getIt.get<Fluwx>();
     _fluwx = getIt.get<Fluwx>();
 
 
     // 处理微信安装检测
     // 处理微信安装检测
@@ -199,8 +208,9 @@ class LoginMainCubit extends Cubit<LoginMainState> {
       return;
       return;
     }
     }
 
 
-    // 控制显示加载框
+    // 控制显示加载框，并启动等待微信授权回调的兜底机制
     emit(state.copyWith(loading: true));
     emit(state.copyWith(loading: true));
+    _startWechatAuthWaiting();
   }
   }
 
 
   Future<void> wechatAuth() async {
   Future<void> wechatAuth() async {
@@ -220,8 +230,9 @@ class LoginMainCubit extends Cubit<LoginMainState> {
       return;
       return;
     }
     }
 
 
-    // 控制显示加载框
+    // 控制显示加载框，并启动等待微信授权回调的兜底机制
     emit(state.copyWith(loading: true));
     emit(state.copyWith(loading: true));
+    _startWechatAuthWaiting();
   }
   }
 
 
   void goLoginPhone() {
   void goLoginPhone() {
@@ -234,6 +245,8 @@ class LoginMainCubit extends Cubit<LoginMainState> {
 
 
   void _responseListener(WeChatResponse response) async {
   void _responseListener(WeChatResponse response) async {
     if (response is WeChatAuthResponse) {
     if (response is WeChatAuthResponse) {
+      // 收到正式回调，结束等待状态（不弹提示）
+      _finishWechatAuthWaiting();
       if (response.code == null || response.code == '') {
       if (response.code == null || response.code == '') {
         emit(state.copyWith(loading: false));
         emit(state.copyWith(loading: false));
         return;
         return;
@@ -353,8 +366,78 @@ class LoginMainCubit extends Cubit<LoginMainState> {
   }
   }
 
 
   @override
   @override
+  void didChangeAppLifecycleState(AppLifecycleState appState) {
+    // App 回到前台时，如果仍在等待微信授权回调，给真实回调一个短窗口；
+    // 窗口内仍未收到 WeChatAuthResponse，则认定为系统层取消（典型场景：
+    // 设备装有多个微信，系统弹出选择器后用户点击取消，微信 SDK 根本不会回调）。
+    if (appState == AppLifecycleState.resumed && _waitingWechatAuth) {
+      _wechatAuthResumeTimer?.cancel();
+      _wechatAuthResumeTimer = Timer(const Duration(milliseconds: 1500), () {
+        if (_waitingWechatAuth) {
+          _finishWechatAuthWaiting(reason: _WechatAuthFinishReason.cancel);
+        }
+      });
+    }
+  }
+
+  // 标记进入"等待微信授权回调"状态，并启动总超时
+  void _startWechatAuthWaiting() {
+    _waitingWechatAuth = true;
+    _wechatAuthTimeoutTimer?.cancel();
+    _wechatAuthTimeoutTimer = Timer(const Duration(seconds: 30), () {
+      if (_waitingWechatAuth) {
+        _finishWechatAuthWaiting(reason: _WechatAuthFinishReason.timeout);
+      }
+    });
+  }
+
+  // 结束等待，统一复位 loading 状态并按场景给出提示
+  void _finishWechatAuthWaiting({
+    _WechatAuthFinishReason reason = _WechatAuthFinishReason.response,
+  }) {
+    if (!_waitingWechatAuth) return;
+    _waitingWechatAuth = false;
+    _wechatAuthTimeoutTimer?.cancel();
+    _wechatAuthResumeTimer?.cancel();
+    _wechatAuthTimeoutTimer = null;
+    _wechatAuthResumeTimer = null;
+    if (state.loading) {
+      emit(state.copyWith(loading: false));
+    }
+    switch (reason) {
+      case _WechatAuthFinishReason.cancel:
+        Fluttertoast.showToast(msg: '已取消微信授权', gravity: ToastGravity.TOP);
+        break;
+      case _WechatAuthFinishReason.timeout:
+        Fluttertoast.showToast(
+          msg: '微信授权超时，请重试',
+          gravity: ToastGravity.TOP,
+          backgroundColor: Colors.red,
+        );
+        break;
+      case _WechatAuthFinishReason.response:
+      // 正常收到回调时不弹提示
+        break;
+    }
+  }
+
+  @override
   Future<void> close() {
   Future<void> close() {
+    WidgetsBinding.instance.removeObserver(this);
+    _wechatAuthTimeoutTimer?.cancel();
+    _wechatAuthResumeTimer?.cancel();
     _fluwxCancelable.cancel();
     _fluwxCancelable.cancel();
     return super.close();
     return super.close();
   }
   }
+
+
+}
+
+enum _WechatAuthFinishReason {
+  // 收到了正式的 WeChatAuthResponse
+  response,
+  // App 已回到前台但仍无回调，判定为系统层/微信侧取消
+  cancel,
+  // 总超时
+  timeout,
 }
 }