How Can I Make A Timer Using String In xCode - swift

Question

So I'm trying to make a chess timer. I'm using string to make the 00:00 in a variable called storeTimed. Is there a way possible to make that used an timer to count down from that?
Here's my code:
The part I need help with is the updateTimer() function. Since the storedTime is a string trying to pass as a Int, xCode isn't liking it. I'm honestly not very sure what I could do. Mostly at the else statement, but the whole part in general
class ChessTimer: UIViewController {
#IBOutlet weak var playerTimer1: UILabel!
#IBOutlet weak var playerTimer2: UILabel!
var timer = Timer()
var time = 10
var isTimerRunning = false
var storedTime = "00:00"
override func viewDidLoad() {
super.viewDidLoad()
if isTimerRunning == false {
runTimer()
}
}
#IBAction func restartButton(_ sender: UIButton) {
}
#IBAction func pausePressed(_ sender: UIButton) {
timer.invalidate()
}
#IBAction func settingsPressed(_ sender: UIButton) {
performSegue(withIdentifier: "goToSettings", sender: self)
}
func runTimer() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self,selector: (#selector(ChessTimer.updateTimer)),userInfo: nil, repeats: true)
isTimerRunning = true
}
#objc func updateTimer() {
if Int(storedTime) < 1 {
timer.invalidate()
playerTimer1.text = "00:00"
playerTimer2.text = "00:00"
}
else {
Int(storedTime)! -= 1
playerTimer1.text = prodTimeString(time: TimeInterval(storedTime)!)
}
}
func prodTimeString(time: TimeInterval) -> String {
let prodMinutes = Int(time) / 60 % 60
let prodSeconds = Int(time) % 60
return String(format: "%02d:%02d", prodMinutes, prodSeconds)
}
#IBAction func playerButton1(_ sender: UIButton) {
}
#IBAction func playerButton2(_ sender: UIButton) {
}
#IBAction func unwindToVC1(sender: UIStoryboardSegue) {
if let settingsController = sender.source as? SettingsController {
playerTimer1.text = settingsController.storedTime
playerTimer2.text = settingsController.storedTime
storedTime = settingsController.storedTime
}
}
}

Answer 1

To keep things simple, here's the code. I have removed the functions that aren't relevant to the discussion - non-implemented buttons, etc.,
The simple idea is that you use numbers (Int / Double / whatever) to store variables that you are counting with, and then have helper functions to present the variable in different formats
import UIKit
class ChessTimer: UIViewController {
var timer = Timer()
var isTimerRunning = false
var storedTime : Int = 0 // use an integer to store the time
override func viewDidLoad() {
super.viewDidLoad()
if isTimerRunning == false {
runTimer()
}
}
func runTimer() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self,selector: (#selector(ChessTimer.updateTimer)),userInfo: nil, repeats: true)
isTimerRunning = true
}
#objc func updateTimer() {
// because we're storing the value in an Int, we don't need to convert it here
storedTime -= 1
if storedTime < 1 {
timer.invalidate()
// use the helper function to format the result for zero time as well as everything else
// that way, if you ever change it, you only have to change in one place
playerTimer1.text = prodTimeString(0)
playerTimer2.text = prodTimeString(0)
}
else {
playerTimer1.text = prodTimeString(storedTime)
}
}
func prodTimeString(_ time: Int) -> String {
// because there's only one parameter, and it's obvious, add '_' then you don't need the label when you call it
let prodMinutes = time / 60 % 60
let prodSeconds = time % 60
return String(format: "%02d:%02d", prodMinutes, prodSeconds)
}
}