Multiple Timer Countdown in App

Hi All,

I have made a rather basic 30 second countdown timer which I will use for pool tournaments as a shot clock. I have working functions for start/stop/extension buttons etc which all work fine however I'm also trying to have a separate timer countdown from 30 minutes or 1 hour which would be changeable like my current timer with the slider bar and this one would be the match clock but unsure how to add a separate timer that doesn't interfere with the shot clock timer already working.

for reference, I'm a beginner at using Xcode :)

Here is where I am currently.

Thanks in advance.

// // ViewController.swift // Shot Clock 5 // // Created by Marcus Allen on 16/03/2022. //

import UIKit import AVFoundation import SwiftUI

class ViewController: UIViewController, UITextFieldDelegate{

var seconds = 30
var timer = Timer()
var audioPlayer = AVAudioPlayer()
var isPlaying = false

@IBOutlet weak var label: UILabel!

@IBOutlet weak var sliderOutlet: UISlider!
@IBAction func slider(_ sender: UISlider)
{
    seconds = Int(sender.value)
    label.text = String(seconds)
}

@IBAction func name2(_ sender: UITextField) {
    sender.resignFirstResponder()
}

@IBAction func name1(_ sender: UITextField) {
    sender.resignFirstResponder()
}

@IBAction func score2(_ sender: UITextField) {
    sender.resignFirstResponder()    }

@IBAction func score1(_ sender: UITextField) {
    sender.resignFirstResponder()
}

@IBOutlet weak var startOutlet: UIButton!
@IBAction func start(_ sender: Any)
{
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.counter), userInfo: nil, repeats: true)
    
    sliderOutlet.isHidden = true
    startOutlet.isHidden = true
}

@objc func counter()
{
    seconds -= 1
    label.text = String(seconds) + ""

    if (seconds == 0)
    {
        timer.invalidate()
    }
    
    if (seconds == 5)
    {
        
        do {

    }
        
        sliderOutlet.isHidden = false
        startOutlet.isHidden = false
        
        audioPlayer.play()
    }
}

@IBAction func EXT2(_ sender: UIButton) {seconds += 15    }
@IBAction func ext2pressed(_ sender: UIButton) {
    sender.backgroundColor = sender.backgroundColor == UIColor.red ? UIColor.clear : UIColor.red    }

@IBAction func EXT1(_ sender: UIButton) {seconds += 15    }
@IBAction func ext1pressed(_ sender: UIButton) {
    sender.backgroundColor = sender.backgroundColor == UIColor.red ? UIColor.clear : UIColor.red
}
@IBAction func ext1resetaudio(_ sender: Any) {
    audioPlayer.stop()
    audioPlayer.currentTime = 0
    isPlaying = false    }
@IBAction func ext2resetaudio(_ sender: Any) {
    audioPlayer.stop()
    audioPlayer.currentTime = 0
    isPlaying = false    }


@IBOutlet weak var stopOutlet: UIButton!
@IBAction func stop(_ sender: Any)
{
    timer.invalidate()
    seconds = 30
    sliderOutlet.setValue(30 , animated: true)
    label.text = "30"
    
    audioPlayer.stop()
    
    sliderOutlet.isHidden = false
    startOutlet.isHidden = false
}
@IBAction func stopresetaudio(_ sender: Any) {
    audioPlayer.stop()
    audioPlayer.currentTime = 0
    isPlaying = false    }

override func viewDidLoad()
{
    super.viewDidLoad()
    
    do
    {
        let audioPath = Bundle.main.path(forResource: "3", ofType: ".mp3")
        try audioPlayer = AVAudioPlayer(contentsOf: URL(fileURLWithPath: audioPath!))
    }
    catch {
        //ERROR
    
    }
}

}