아미(아름다운미소)

타이머 사용하여 1초마다 1씩 증가하기 - Timer.scheduledTimer() - Timer.invalidate() - Timer.isValid import UIKit class ViewController: UIViewController { //ui @IBOutlet weak var txtTime: UILabel! @IBOutlet weak var btnStart: UIButton! @IBOutlet weak var btnEnd: UIButton! //timer var mTimer : Timer? var number = 0 let interval = 1.0 let timeSelector: Selector = #selector(ViewController.timerCallback) override fu..