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 vote113 views1 answer
Log HTTPURLRESPONSE swift
Swift
0 vote146 views1 answer
How to low case string swift
Swift
0 vote123 views3 answers
Swift - salesforce chat only
Swift
0 vote119 views1 answer
Swift repeating array
Swift
1 vote119 views1 answer
Add toggle without text swiftui
Swift
0 vote130 views1 answer
Use a compatible library with a minSdk of at most 16, or increase this project's minSdk version to at least 19, or use tools:overrideLibrary="com.google.firebase.firebase_analytics"
Swift
6 votes148 views1 answer
Create dictionary swift
Swift
2 votes114 views1 answer
Declare function in swift
Swift
0 vote124 views1 answer
Xcode create image from calayer
Swift
0 vote200 views1 answer
Get height of navigation bar swift
Swift