CODEWITHSUNDEEP
formatnstimercountdown
MercedesFan Page
MercedesFan Page

Reputation: 13

How to do a CountDown timer using Swift

Hello I am developing a countdown timer,which has to stop after 8 hours. Here it is:

import UIKit

class ViewController: UIViewController {

   var timer = NSTimer()
   var counter = 0

@IBOutlet weak var Label: UILabel!

override func viewDidLoad() {
super.viewDidLoad()
  // Do any additional setup after loading the view, typically from a   nib.
}

 override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
  // Dispose of any resources that can be recreated.
 }

@IBAction func Start(sender: AnyObject) {
counter = 28800
Label.text = String(counter)
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTimer"), userInfo: nil, repeats: true)
     }

  func updateTimer () {

counter -= 1
Label.text = String(counter)

 }

 @IBAction func Stop(sender: AnyObject) {

timer.invalidate()
 }
 }

But in stead of having 28800 seconds (which is 8hours)I want to display 08:00:00 , 07:59:59 , 07:59:58, so on... At the moment it is showing 28800, 28799, 28798, so on. Do you have an idea how to format it as a real clock (08:00:00)?

Upvotes: 1

Views: 1506

Answers (1)

Chuck Dulde
Chuck Dulde

Reputation: 33

I had the same problem and pretty much a noob in xcode/swift - but after reviewing several sources, here's what I put together that works for me:

Replace your:

func updateTimer () {

counter -= 1
Label.text = String(counter)
}

With this:

func updateTimer () {
        counter -= 1
        let hours = Int(counter) / 3600
        let minutes = Int(counter) / 60 % 60
        let seconds = Int(counter) % 60
        Label.text = String(format: "%02i:%02i:%02i",hours,minutes,seconds)
}

(xcode 8.1 warns about use of "let" or "var" for hours/minutes/seconds, but it still works)

Result look like:

00:00:00

Upvotes: 2

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