How to add two value by using UserDefault - swift

Question

I'm trying to make a simple ToDo app in Swift.
I want to add not only task but also Date,
but I don't know how to add two values to a variable.
I want to add a text which get from UIDatePicker to TodoAdded.
Could you give me any advise please?
import UIKit
//Variable
var TodoAdded = [String]()
class AddController: UIViewController {
//TextField
#IBOutlet weak var TodoTextField: UITextField!
//TextField for Date
#IBOutlet weak var DateTextField: UITextField!
var datePicker: UIDatePicker = UIDatePicker()
//追加ボタンの設定
#IBAction func TodoAddButten(_ sender: Any) {
//Add typed text to variable
TodoAdded.append(TodoTextField.text!)
//Empty after tapped button
TodoTextField.text = ""
//Add to UD
UserDefaults.standard.set( TodoAdded, forKey: "TodoList" )
}
override func viewDidLoad() {
super.viewDidLoad()
// Picker Setting
datePicker.datePickerMode = UIDatePicker.Mode.dateAndTime
datePicker.timeZone = NSTimeZone.local
datePicker.locale = Locale.current
DateTextField.inputView = datePicker
//
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 35))
let spacelItem = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
let doneItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(done))
toolbar.setItems([spacelItem, doneItem], animated: true)
// InputView
DateTextField.inputView = datePicker
DateTextField.inputAccessoryView = toolbar
}
//
#objc func done() {
DateTextField.endEditing(true)
// Format
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
DateTextField.text = "\(formatter.string(from: Date()))"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}

Answer 1

You can try to save it as [String:[String]]
UserDefaults.standard.set([dateTextField.text!:todoAdded], forKey: "TodoList" )
A good approach is
struct Root:Codable {
let date:Date
let tasks:[String]
}
Then use JSONDecoder / JSONEncoder to convert to object / data , after that you can easily save / read them