//

// ViewController.swift

// Gill.light

//

// Created by Amado Gil on 2/20/23.

//

import UIKit

class ViewController: UIViewController {

var lightOn = true

override func viewDidLoad() {

super.viewDidLoad()

updateUI()

// Do any additional setup after loading the view.

}

func updateUI() {

view.backgroundColor = lightOn ? .white : .black

}

@IBAction func buttonPressed(_ sender: UIButton) {

lightOn.toggle()

updateUI()

}

}

SWIFT LANGUAGE

By the end of this guided project, you'll have created an app named Light that changes the screen from black to white and back again when the user taps a button.

I'm having issued with my application running properly. When I run simulator, an error shows (see picture attached). Please help find solution to fix this.