Question

我将API集成到Swift中相对较新。我有一个登录页面，我正在尝试对用户进行身份验证并在他们登录时创建会话。我在网上发现了一个可能适用于很多人的代码，但是我实际上无法完成整个工作。我已经得出结论，在这一行附近会出现问题，你将在下面的代码中看到，因为在它之前的行我能够获得身份验证令牌。

if let data_block = server_response["accessToken"] as? NSDictionary

我包含了所有相关代码，我想知道出了什么问题，如何成功验证和创建会话，以及让segue实际工作。

 override func viewDidLoad() {
    super.viewDidLoad()

    _login_button = "Login"

    let preferences = UserDefaults.standard

    if(preferences.object(forKey: "session") != nil)
    {
        LoginDone()
    }
    else
    {
        LoginToDo()
    }

}


@IBAction func signIn() {


    let username = emailLoginTextField.text
    let password = passwordLoginTextField.text

    if(username == "" || password == "")
    {
        return
    }

    if(_login_button == "Logout")
    {
        let preferences = UserDefaults.standard
        preferences.removeObject(forKey: "session")

        LoginToDo()
        return
    } else {
        DoLogin(username!, password!)
    }    
}

func DoLogin(_ user:String, _ psw:String)
{
    let url = URL(string: "http://agile-castle-10059.herokuapp.com/authentication")
    let session = URLSession.shared

    let request = NSMutableURLRequest(url: url!)
    request.httpMethod = "POST"

    let paramToSend = "username=" + user + "&password=" + psw + "&strategy=" + "local"

    request.httpBody = paramToSend.data(using: String.Encoding.utf8)


    let task = session.dataTask(with: request as URLRequest, completionHandler: {
        (data, response, error) in

        guard let _:Data = data else
        {
            return
        }

        let json:Any?

        do
        {
            json = try JSONSerialization.jsonObject(with: data!, options: [])
        }
        catch
        {
            return
        }


        guard let server_response = json as? NSDictionary else
        {

            return
        }

//problem occurs around here, nothing happens (assuming the data_block isn't being created for some reason)

        if let data_block = server_response["data"] as? NSDictionary
        {
            if let session_data = data_block["session"] as? String
            {
                let preferences = UserDefaults.standard
                preferences.set(session_data, forKey: "session")

                DispatchQueue.main.async (
                    execute:self.LoginDone
                )
            }
        }

    })

    task.resume()

}


func LoginToDo()
{
    _login_button = "Login"
}

func LoginDone()
{
     self.shouldPerformSegue(withIdentifier: "showHomeViewControllerFromSignIn", sender: self)
    _login_button = "Logout"
}

Answer 1

我解决了一些事情并弄明白了

 guard let server_response = json as? NSDictionary else
        {
            return
        }


            if let session_data = server_response["accessToken"] as? String
            {
                let preferences = UserDefaults.standard
                preferences.set(session_data, forKey: "accessToken")

                DispatchQueue.main.async (
                    execute:self.LoginDone
                )
            }


    })

    task.resume()

}

会话认证令牌Swift

1 个答案: