/Swift/How do i have countdown timer in swift stackoverflow

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

Similar codes

0 vote219 views1 answer
Swiftui divider remove padding
Swift
0 vote240 views1 answer
Textchange in textview swift
Swift
0 vote214 views1 answer
Get class name swift
Swift
0 vote222 views1 answer
ChevronDownf6a06a60-2122-49d0-86a0-03ba8c532aec
Swift
0 vote234 views1 answer
Swift loop through 2 arrays at once
Swift
-1 vote176 views1 answer
Get index from array swift
Swift
0 vote236 views1 answer
Fade anumation swift
Swift
1 vote228 views1 answer
Swift uitableview insert cell
Swift
1 vote210 views1 answer
How to find index of list item in Swift?
Swift
1 vote182 views1 answer
How to get image from pdf swift
Swift