/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 vote151 views1 answer
Swift increase int value
Swift
1 vote162 views1 answer
Swift create a method who can return result or throw an error
Swift
0 vote146 views1 answer
Func that returns a view swiftui
Swift
-1 vote154 views2 answers
UICollectionviewcontroller reload data
Swift
0 vote156 views1 answer
Activity indicator swiftui
Swift
0 vote172 views1 answer
Convert uiimage to data swift
Swift
0 vote158 views1 answer
Remove cocoapods swiftr
Swift
14 votes308 views3 answers
Swift for loop
Swift
1 vote152 views1 answer
Swift javascript injection
Swift
1 vote168 views1 answer
Hex color extension swift
Swift