/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 vote378 views2 answers
Rounded ios button
Swift
0 vote368 views2 answers
Xcode derived data
Swift
1 vote406 views2 answers
Swift add navigation bar
Swift
0 vote362 views2 answers
Swift date difference in days
Swift
1 vote410 views1 answer
Run a function only once swift
Swift
0 vote444 views2 answers
Get keyboard height swift
Swift
0 vote403 views1 answer
Swift sort list true before false
Swift
1 vote410 views1 answer
How to make a image flip swift
Swift
1 vote427 views1 answer
How to remove subview siwft 5
Swift
0 vote379 views1 answer
Swift add two arrays
Swift