How do I add a timer using Swift? - swift

Question

I have come across a lot of questions similar to this, but many were for older versions of Xcode, or simply did not work.
I'm using Xcode Version 8.3.2 (8E2002) and Swift coding language. I don't know much about coding, but am young and eager to learn!
I'm creating a clicker game that will give you money per second that you are on the game itself. So if you idle for 2 minutes, it would give you $120 ($1per second #120 sec). In addition to this, you also can earn money from clicking the main object.
Here is my coding so far:
import UIKit
class ViewController: UIViewController {
var score = 0
var add = 1
func addpersec() {
score += 1
}
//func used to add to the score based timer. Aka, adding 1 per second
#IBOutlet weak var scorecount: UILabel!
#IBAction func clicks(_ sender: Any) {
score += 1
scorecount.text = "Honey: \(score)"
}
#IBOutlet weak var Bees: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

class ViewController: UIViewController {
var timer: Timer? = nil // Property
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(handleTimer), userInfo: nil, repeats: true)
}
func handleTimer(_ timer: Timer) {
print("Timer ticking!")
}
}
To invalidate the timer, call self.timer?.invalidate()

Answer 2

Your question seems to be related to iOS UI, so I don't know if my answer makes sense.
For general purpose delayed function execution (like Javascript's setTimeout), you can use a DispatchQueue
// have this as a global somewhere
let bg = DispatchQueue(label: "bg", qos: .background, target: nil)
// anywhere else in your code:
// First decide the time to execute your function
let delayInSeconds = 3
let when = DispatchTime.now() + delayInSeconds
// call it
bg.asyncAfter(deadline: when) {
// code to execute later (this is the body of an anonymous function)
}