注销用户并在新用户中签名

Question

我正在使用Alamofire进行基本身份验证，我有一个类可以存储到已登录的用户信息中。

我的问题是，当我签署一个用户然后签名并尝试登录其他用户时，我仍然会收到第一个用户退出的用户信息。

我的用户类：

class User {
    var userJSON: [String:AnyObject]?
}

let sharedUser = User()

认证

Alamofire.request(.GET, "https://gyminyapp.azurewebsites.net/api/User").authenticate(user: emailTextField.text!, password: passwordTextField.text!).responseJSON {
                json in
                let responseJSON = json.result.value as? [String: AnyObject]
                // print("JSON: \(responseJSON)")
                if responseJSON!["message"] != nil {
                    let errorMessage = responseJSON!["message"] as! String
                    alert = UIAlertController(title: "Error", message: errorMessage, preferredStyle: .Alert)
                    alert?.addAction(okButton)
                    alert!.view.tintColor = BarItems.greenTintColor
                    self.presentViewController(alert!, animated: true, completion: nil)
                } else {
                    if responseJSON != nil {
                        sharedUser.userJSON = responseJSON
                    }

                    self.performSegueWithIdentifier("tabSegue", sender: nil)
                }
            }

退出：

     sharedUser.userJSON = nil

    // Return user to sign in screen
    self.dismissViewControllerAnimated(true, completion: nil)

我也尝试了这个建议How to make basic auth with Alamofire?，它引发了＃34;意外地在if self.responseJSON!["message"] != nil发现了

let user = emailTextField.text
            let password = passwordTextField.text
            let credentialData = "\(user):\(password)".dataUsingEncoding(NSUTF8StringEncoding)!
            let base64Credentials = credentialData.base64EncodedStringWithOptions([])
            let headers = ["Authorization": "Basic \(base64Credentials)"]
            Alamofire.request(.GET, "https://gyminyapp.azurewebsites.net/api/User", headers: headers)
                .responseJSON {
                    json in
                    self.responseJSON = json.result.value as? [String: AnyObject]
                    print("JSON: \(self.responseJSON)")
                    if self.responseJSON!["message"] != nil {
                        let errorMessage = self.responseJSON!["message"] as! String
                        alert = UIAlertController(title: "Error", message: errorMessage, preferredStyle: .Alert)
                        alert?.addAction(okButton)
                        alert!.view.tintColor = BarItems.greenTintColor
                        self.presentViewController(alert!, animated: true, completion: nil)
                    } else {
                        if self.responseJSON != nil {
                            sharedUser.userJSON = self.responseJSON
                            print(sharedUser.userJSON)
                        }

                        self.defaults.setObject(self.emailTextField.text!, forKey: "emailAddress")
                        self.defaults.setObject(self.passwordTextField.text!, forKey: "password")

                        self.performSegueWithIdentifier("tabSegue", sender: nil)
                    }
            }