Home/ Questions/How do i have countdown timer in swift?
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Zoé Meyer
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Asked: 2022-04-27T11:03:17+00:00 In:

How do i have countdown timer in swift?

  • 31

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I am very confused about countdown timer in swift. Can you instruct some methods that will lead to a conclusion?

♦ Suggestions of ITtutoria Team
Ideas for countdown timer swift: Countdown timers in swift are great for various uses, but are commonly used for countdown toasts. They allow you to set a timer and show the current time remaining on the screen …

Here is an example code.

var remainTime = 40

@IBOutlet var timerTextField: UILabel!

override func viewDidLoad() {
   super.viewDidLoad()

   var countDownTimer = Timer.scheduledTimer(target: self, timeInterval: 0.5, userInfo: nil, repeats: true)

   if(remainTime > 0) {
     timerTextField.text = String((remainTime--)
   } else {
     countDownTimer.invalidate()
   }
}
countdown
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3 Answers

  1. Best Answer
    @IBAction func start(sender: UIButton) {
     self.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(ViewController.update(_:)), userInfo: nil, repeats: true)
     NSRunLoop.currentRunLoop().addTimer(self.timer, forMode: NSRunLoopCommonModes)
  
     // Need to add new instance variable
     startTime = NSDate() 
​
func update() {
    let elapsedTime = NSDate().timeIntervalSinceDate(startTime)
    let currTime = totalTime - elapsedTime
   
    //total time is an instance variable that tracks the total seconds
    countDown.text = String(currTime)
    if currTime < 0 {
        timer.invalidate()
        //do something
    }
}

    Here is the code that I referenced on stackoverflow.com

    • 15

  2. Create a countdown timer

    var secondsRemaining = 60​
​
Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true)
}
@objc func updateCounter(){
    if secondsRemaining > 0 {
    print("\(secondsRemaining) seconds.")
    secondsRemaining -= 1
            }
        }​
    • 20

  3. Everything will be made clear to you via the following way.

    var timer = NSTimer()
timer(timeInterval: 0.01, target: self, selector: update, userInfo: nil, repeats: false)
    • 12

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