import UIKit class ViewController: UIViewController { var arrays = ["A", "b", "C", "D", "E", "F"] var currentIndex = 0 @IBOutlet weak var ChangeText: UILabel! override func viewDidLoad() { super.viewDidLoad() ChangeText.text = arrays[currentIndex] } @IBAction func Button() { currentIndex++ if (currentIndex == arrays.count { currentIndex = 0 } ChangeText.text = arrays[currentIndex] } }