mport UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
weak var timer: Timer?
var startTime: Double = 0
var time: Double = 0
@IBOutlet weak var timeValueLabel1: UILabel!
@IBOutlet weak var timeValueLabel: UILabel!
@IBAction func stop1Button() {
let timeString = String(format: "%.3f", time)
timeValueLabel1.text = timeString
}
@IBAction func stopButton() {
let timeString = String(format: "%.3f", time)
timeValueLabel.text = timeString
}
override func viewDidAppear(_ animated: Bool) {
startTime = Date().timeIntervalSinceReferenceDate
timer = Timer.scheduledTimer(timeInterval: 0.001,
target: self,
selector: #selector(advanceTimer(timer:)),
userInfo: nil,
repeats: true)
}
override func viewWillDisappear(_ animated: Bool) {
timer?.invalidate()
}
func advanceTimer(timer: Timer) {
time = Date().timeIntervalSinceReferenceDate - startTime
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
/
}
}
