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

Question

I want to add a score to the top of my scene in the game I am working on. The score is going to based on how long you last, and will increase every second. Thanks for the he

Answer 1

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()
}