Xcode：存儲用戶名和密碼

Question

我有一個登錄視圖控制器，用戶需要鍵入用戶名和密碼才能看到主頁。現在用戶必須每次輸入用戶名和密碼，這是不方便的。我需要有一個「記住用戶名」和「記住密碼」的複選框，以便用戶可以選擇是否希望他們下次登錄時存儲密碼的用戶名。

任何好的方法來做到這一點？或者我必須使用鑰匙扣，這是很多人認爲最好的方法嗎？

我的代碼如下：

import UIKit 

import Firebase 

class LoginViewController: UIViewController { 

    var imageView: UIImageView! 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     imageView = UIImageView(frame: view.bounds) 
     imageView.contentMode = .scaleAspectFill 
     imageView.clipsToBounds = true 
     imageView.image = #imageLiteral(resourceName: "background") 
     imageView.center = view.center 
     view.addSubview(imageView) 
     self.view.sendSubview(toBack: imageView) 
     activityIndicator.hidesWhenStopped = true 

    } 

    //Outlets 
    @IBOutlet weak var emailTextField: UITextField! 
    @IBOutlet weak var passwordTextField: UITextField! 


    //Login Action 
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView! 

    @IBAction func loginAction(_ sender: AnyObject) { 
     self.activityIndicator.startAnimating() 

     if self.emailTextField.text == "" || self.passwordTextField.text == "" { 

      //Alert to tell the user that there was an error because they didn't fill anything in the textfields because they didn't fill anything in 

      let alertController = UIAlertController(title: "Error", message: "Please enter an email and password.", preferredStyle: .alert) 

      let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil) 
      alertController.addAction(defaultAction) 

      self.present(alertController, animated: true, completion: nil) 

      self.activityIndicator.stopAnimating() 

     } else { 

      Auth.auth().signIn(withEmail: self.emailTextField.text!, password: self.passwordTextField.text!) { (user, error) in 

       if error == nil { 

        //Print into the console if successfully logged in 
        print("You have successfully logged in") 

        //Go to the HomeViewController if the login is sucessful 
        let vc = self.storyboard?.instantiateViewController(withIdentifier: "Home") 
        self.present(vc!, animated: true, completion: nil) 

        self.activityIndicator.stopAnimating() 

       } else { 

        //Tells the user that there is an error and then gets firebase to tell them the error 
        let alertController = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: .alert) 

        let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil) 
        alertController.addAction(defaultAction) 

        self.present(alertController, animated: true, completion: nil) 

        self.activityIndicator.stopAnimating() 
       } 
      } 
     } 

    } 
} 

Answer 1

下面是一些方法，可以在其中存儲您的憑據：

1. NSUserDefault

2. 的plist

3. 鑰匙鏈商店

4. 本地數據庫（SQLite的）

5. CoreData

從上面所有，NSUserDefault和鑰匙扣都是用最好的，簡單的方法。

NSUserDefault：

存儲到默認值：

UserDefaults.standard.set(true, forKey: "Key") //Bool 
UserDefaults.standard.set(1, forKey: "Key") //Integer 
UserDefaults.standard.set("TEST", forKey: "Key") //setObject 

從默認獲取：

UserDefaults.standard.bool(forKey: "Key") 
UserDefaults.standard.integer(forKey: "Key") 
UserDefaults.standard.string(forKey: "Key") 

鑰匙鏈：。 Checkout this demo for keychain.

Answer 2

您可以使用以下方法中的任何一個 -

1. NSUserDefaults的
2. KeychainWrapper
3. NSURLCredential

參考網址iOS: How to store username/password within an app?

Answer 3

鑰匙扣是存儲原始密碼的最安全的地方。它意味着比任何其他地方都更好。

您可以使用KeychainWrapper這是從Apple’s Keychain Services Programming Guide提供。