/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 vote215 views1 answer
Nil coalescing swift
Swift
1 vote168 views2 answers
Swift create custom button programmatically
Swift
1 vote130 views2 answers
How to dismiss keyboard in swift
Swift
0 vote125 views1 answer
Swift convert frame to another view
Swift
0 vote124 views1 answer
Change multiplier programactlilly ios swift
Swift
10 votes250 views2 answers
Alertdialog flutter
Swift
0 vote115 views1 answer
Make text autoresize swiftui
Swift
0 vote123 views1 answer
Remove back button text nav bar swift
Swift
0 vote121 views1 answer
Swift uknow attrubute main
Swift
0 vote157 views1 answer
Swift 5 macos close app
Swift