/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 vote230 views1 answer
Mac os
Swift
1 vote245 views1 answer
Check when webview finish loading swift
Swift
0 vote413 views1 answer
Swift chuck array in peases
Swift
0 vote235 views1 answer
Turning an arrya into a set swift
Swift
2 votes238 views1 answer
Swiftui padding one line
Swift
0 vote218 views1 answer
Fade anumation swift
Swift
2 votes333 views1 answer
Xcode get info from text field
Swift
0 vote244 views1 answer
Swift create array from range
Swift
1 vote240 views1 answer
How to find index of list item in Swift?
Swift
0 vote182 views1 answer
Placeholder color swift
Swift