Timer in swift stack overflow

How do i have countdown timer in swift stackoverflow

@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)
    startTime = NSDate() // new instance variable that you would need to add.
}

func update() {
    let elapsedTime = NSDate().timeIntervalSinceDate(startTime)
    let currTime = totalTime - elapsedTime
    //total time is an instance variable that is the total amount of time in seconds that you want
    countDown.text = String(currTime)
    if currTime < 0 {
        timer.invalidate()
        //do other stuff that you need to do when time runs out.
    }
}

Source: stackoverflow.com

Timer in swift stack overflow

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

Source: stackoverflow.com

Similar codes

0 vote199 views1 answer
Swift loop through array of objet
Swift
0 vote198 views1 answer
Swift enum storyboard
Swift
0 vote227 views1 answer
Swift check if regex is in string
Swift
0 vote257 views1 answer
Swift collectionview ispagingenabled change page size
Swift
0 vote221 views1 answer
Swift dictionary sorted
Swift
2 votes217 views1 answer
Swift firebase read key in autoKey
Swift
0 vote188 views1 answer
Swift dispatch after
Swift
0 vote192 views1 answer
Swift reduce function
Swift
0 vote198 views1 answer
Fullscreencover swiftui
Swift
1 vote203 views1 answer
Swift compare string to button title
Swift