How can I make a function execute every second in swift?

You can use one like this:

var timer = NSTimer()override func viewDidLoad() {    scheduledTimerWithTimeInterval()}func scheduledTimerWithTimeInterval(){    // Scheduling timer to Call the function "updateCounting" with the interval of 1 seconds    timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateCounting"), userInfo: nil, repeats: true)}      func updateCounting(){    NSLog("counting..")}

Swift 3:

var timer = Timer()override func viewDidLoad() {               // Use for the app's interface    scheduledTimerWithTimeInterval()}override func didMove(to view: SKView) {    // As part of a game    scheduledTimerWithTimeInterval()}func scheduledTimerWithTimeInterval(){    // Scheduling timer to Call the function "updateCounting" with the interval of 1 seconds    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.updateCounting), userInfo: nil, repeats: true)}@objc func updateCounting(){    NSLog("counting..")}

Swift 5:

Note: this solution is compatible with iOS 10.0+.

// If needing to check for iOS compatibility use// if #available(iOS 10.0, *) {code}var timer = Timer()override func viewDidLoad() {    self.timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { _ in        updateCounting()    })}func updateCounting(){    print("counting...")}

You can then invalidate (stop) the timer using:

timer.invalidate()

There is something called NSTimer in swift which could solve your problem. I have given an example like how you can use it. Just customise it for your purpose.

var timer = NSTimer.scheduledTimerWithTimeInterval(1.0,                                                    target: self,                                                    selector: Selector("yourMethodToCall"),                                                    userInfo: nil,                                                    repeats: true)

Add this line to the place where you need to call your function repeatedly.

1. The 1.0 refers to 1 second.
2. Change the selector to call yourMethodName
3. repeats is set to true to call that function every second.

Try this out and let me know if your are stuck somewhere. Thanks.

Swift 3

find this solution it worked for me

weak var timer: Timer?var timerDispatchSourceTimer : DispatchSourceTimer?func startTimer() {    if #available(iOS 10.0, *) {        timer = Timer.scheduledTimer(withTimeInterval: 3, repeats: true) { [weak self] _ in            // do something here        }    } else {        // Fallback on earlier versions        timerDispatchSourceTimer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.main)        timerDispatchSourceTimer?.scheduleRepeating(deadline: .now(), interval: .seconds(60))        timerDispatchSourceTimer?.setEventHandler{                // do something here        }        timerDispatchSourceTimer?.resume()    }}func stopTimer() {    timer?.invalidate()    //timerDispatchSourceTimer?.suspend() // if you want to suspend timer     timerDispatchSourceTimer?.cancel()}// if appropriate, make sure to stop your timer in `deinit`deinit {    stopTimer()}