import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var pseudo_ui: UITextField!

    private var myPseudo: String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        if let myPseudo = UserDefaults.standard.value(forKey: "Pseudo") as? String {
            self.myPseudo = myPseudo
            pseudo_ui.text = myPseudo
        }
    }

    @IBAction func saveButtonTapped(_ sender: Any) {
        guard let pseudo =  pseudo_ui.text else { return }
        UserDefaults.standard.set(pseudo, forKey: "Pseudo" )
    }

}