环境描述：系统IOS 12.4 ，微信版本 7.0.8， SDK 1.8.6, 错误日志： Error:set token fail, errCode:4, errLog:wx token[] or contextId[(null)] is nil 状态描述：可以看到有跳转微信的过程，但是不能正确获取微信授权界面。但是又能拿到相应的返回值，很奇怪，有人遇到过嘛？ 相关代码：      //三个重写的API func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {         returnWXApi.handleOpen(url, delegate: self)           //    func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool { //        return WXApi.handleOpen(url, delegate: self) //    }      func application(_application: UIApplication, handleOpen url: URL) -> Bool{         returnWXApi.handleOpen(url, delegate: self)           func application(_ application: UIApplication, continueuserActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {         logger.info("调用useractivity"         returnWXApi.handleOpenUniversalLink(userActivity, delegate: self)      //回调  func onResp(_ resp: BaseResp) {         logger.info(String(format: "返回的resp是：%p", resp))                 //微信登录         ifresp is SendAuthResp {             logger.info("微信登录接口" //            switch(resp.errCode){ //            case 0: //                let response = resp as! SendAuthResp //                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "WXLoginSuccessNotification"), object: response.code) //                break //            case -4: //用户拒绝 //                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "WXLoginDenyNotification"), object: nil) //                break //            case -2: //用户取消 //                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "WXLoginCancelNotification"), object: nil) //                break //            default: //                break //            }             ifresp.errCode == 0 && resp.type == 0 {//授权成功                 let response = resp as! SendAuthResp                 NotificationCenter.default.post(name: NSNotification.Name(rawValue: "WXLoginSuccessNotification"), object: response.code)             // end of internal if             return         // end of external if     // end of onResp // send @IBAction func wechatLogin(_ sender: LGButton) {     sender.isLoading = true     ifWXApi.isWXAppInstalled() {         let app = UIApplication.shared         ifapp.canOpenURL(URL.init(string: WEIXIN_SCHEME)!) {             let req = SendAuthReq.init()             req.scope = "snsapi_message,snsapi_userinfo,snsapi_friend,snsapi_contact"             req.state = "\(arc4random()%100)"             logger.info("准备开启微信登录!"             let deadlineTime = DispatchTime.now() + .seconds(1)             DispatchQueue.main.asyncAfter(deadline: deadlineTime) {                 //停止转圈圈                WXApi.send(req,  completion: { (success) in                sender.isLoading = false                logger.info("成功获取微信app的授权，开始向微信服务器发起请求!"                })}         } else             if#available(iOS 10.0, *) {                 UIApplication.shared.open(URL.init(string: "http://weixin.qq.com/r/qUQVDfDEVK0rrbRu9xG7")!, options: [:], completionHandler: nil)             } else                 // Fallback on earlier versions                 UIApplication.shared.openURL(URL.init(string: "http://weixin.qq.com/r/qUQVDfDEVK0rrbRu9xG7")!)                          else         self.sendmsgToWxServer()         sender.isLoading = false           // 登录成功之后 @objc func WXLoginSuccess(notification:Notification) {         logger.info("WXLoginSuccess开始执行"         let code = notification.object as! String         let requestUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=\(WX_APPID)&secret=\(WX_APPSecret)&code=\(code)&grant_type=authorization_code"                           DispatchQueue.global().async {             let requestURL: URL = URL.init(string: requestUrl)!             let data = try? Data.init(contentsOf: requestURL, options: Data.ReadingOptions())                          //TODO： 从微信获取到的用户信息，然后再回传到app的后台服务器             DispatchQueue.main.async {                 let jsonResult = try! JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! Dictionary<String,Any>                 logger.info("微信app传回来的数据: \(jsonResult)"                 let openid: String = jsonResult["openid"] as! String                 let access_token: String = jsonResult["access_token"] as! String                 let unionid: String = jsonResult["unionid"] as! String                                  self.openid = openid                                  //向app服务器保存用户的openid和access_token                 let parameters: Parameters = ["openId": openid, "accessToken": access_token]                 AF.request(SAVE_USER_INFO_URL_STR, parameters: parameters).validate()                                  let homeVcUrlStr = String(format: "%@%@", arguments: [HOMEPAGE_LOGINED_URL_STR, unionid])                                  logger.info(String(format:"homeStr: %@, openid: %@", arguments:[homeVcUrlStr, openid]))                                                   let mainNavigationController = self.presentingViewController as! LFMainNavigationController                 let homePageController = mainNavigationController.viewControllers[0] as! LFHomeViewController                                  homePageController.openid = self.openid                 homePageController.homePageUrlStr = homeVcUrlStr                                  self.dismiss(animated: true, completion: {                 }) // end of dismiss                                  //暂时不需要从微信服务器获取用户的信息 //                self.getUserInfo(openid: openid, access_token: access_token)                            有人能帮忙看看嘛？ 或者有人遇到相似的问题嘛 ？ 求交流 ！！！ 网页回复不及时可加微信：dzjMichael    ( 加时注明来源  不甚感激！！！ ———————————————————————————— 2020 - 01 -07更新 问题已经解决，发现是UL配置的问题，建议各位老铁多多检查自己的配置吧，从scheme到ul，然后再试自己的代理函数，基本上照着文档来一般不会有问题。