Xcode: Store Username and Password - ios

Question

I have a login view controller that users need to type username and password in order to see the homepage. Now the users must type in the username and password every single time, which isn't convenient. I need to have a check box for "remember username" and "remember password" so that users can choose wether or not they would like to have their username of password stored the next time they login.
Any good way to do that? Or do I have to use Keychain, which according to many people is the best way?
My code is as follows:
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

Below are some ways in which you can stored your credential:
NSUserDefault
plist
KeyChain Store
Local Database (SQLite)
CoreData
From above all, NSUserDefault and Keychain are best and easy way to use.
NSUserDefault:
For Storing into Default:
UserDefaults.standard.set(true, forKey: "Key") //Bool
UserDefaults.standard.set(1, forKey: "Key") //Integer
UserDefaults.standard.set("TEST", forKey: "Key") //setObject
Getting from Defaults:
UserDefaults.standard.bool(forKey: "Key")
UserDefaults.standard.integer(forKey: "Key")
UserDefaults.standard.string(forKey: "Key")
KeyChain: . Checkout this demo for keychain.

Answer 2

You can use any one of the below approach -
NSUserDefaults
KeychainWrapper
NSURLCredential
Reference URL iOS: How to store username/password within an app?

Answer 3

Keychain is the most secure place to store the raw password.It means better than any other places.
You can use KeychainWrapper which is providing from Apple’s Keychain Services Programming Guide.