Timer in swift stack overflow

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

Timer in swift stack overflow

var timer = NSTimer()
timer(timeInterval: 0.01, target: self, selector: update, userInfo: nil, repeats: false)

Source: stackoverflow.com

Similar codes

0 vote324 views1 answer
Procedural audio with swift
Swift
1 vote342 views1 answer
Get index filter swift
Swift
0 vote304 views1 answer
Swift from 1 to 01
Swift
0 vote359 views2 answers
How to have diffrent size images in a stack view swift
Swift
0 vote350 views1 answer
Swift wait until condition is true
Swift
0 vote329 views1 answer
Swift reading binary data
Swift
0 vote269 views1 answer
Swiftui set up a binding in init
Swift
0 vote277 views1 answer
Placeholder color swift
Swift
0 vote381 views1 answer
Change textview link color swift
Swift
0 vote407 views1 answer
Swift iOS15 navigationbar stying broken
Swift