Xcode：存储用户名和密码

Question

我有一个登录视图控制器，用户需要键入用户名和密码才能看到主页。现在用户必须每次输入用户名和密码，这是不方便的。我需要有一个“记住用户名”和“记住密码”的复选框，以便用户可以选择是否希望他们下次登录时存储密码的用户名。

任何好的方法来做到这一点？或者我必须使用钥匙扣，这是很多人认为最好的方法吗？

我的代码如下：

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，可以在其中存储您的凭据：

1. NSUserDefault

2. 的plist

3. 钥匙链商店

4. 本地数据库（SQLite的）

5. CoreData

从上面所有，NSUserDefault和钥匙扣都是用最好的，简单的方法。

NSUserDefault：

存储到默认值：

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

从默认获取：

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

钥匙链：。 Checkout this demo for keychain.

Answer 2

您可以使用以下方法中的任何一个 -

1. NSUserDefaults的
2. KeychainWrapper
3. NSURLCredential

参考网址iOS: How to store username/password within an app?

Answer 3

钥匙扣是存储原始密码的最安全的地方。它意味着比任何其他地方都更好。

您可以使用KeychainWrapper这是从Apple’s Keychain Services Programming Guide提供。