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 vote156 views1 answer
Url encode xcode
Swift
0 vote186 views1 answer
How to low case string swift
Swift
1 vote158 views1 answer
Swift core data sort by date
Swift
0 vote157 views1 answer
Get last element of array swift
Swift
0 vote174 views1 answer
Parse int in swift
Swift
2 votes189 views1 answer
Xcode hide keyboard when touch background storyboard
Swift
2 votes138 views2 answers
Swift func for constraint
Swift
0 vote158 views1 answer
Mac os
Swift
5 votes193 views2 answers
Navigationview hide header swiftui
Swift
1 vote159 views1 answer
Remove padding hstack swiftui
Swift