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

I prefer

var timer: Timer?

override func viewDidLoad() {
    super.viewDidLoad()          

    timer =  Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { (timer) in                
        // Do what you need to do repeatedly         
    }
}

To stop it:

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    if timer != nil {
        timer?.invalidate()
        timer = nil
    }
}