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I have been looking at previous questions, however, they seem to be outdated or do not work for my case. In my application I want to increase a variable (money) every second by another variable (cps). When I try doing forever loops or using timers, I either get errors or nothing occurs.

class SecondViewController: UIViewController 
 var money = 0
 var cost = 20
 var clicks = 1
 var cost2 = 50
 var CPS: Int = 0
 var truth = true

 @IBOutlet weak var costOutlet2: UILabel!
 @IBOutlet weak var errorLabel: UILabel!
 @IBOutlet weak var cpsButtonOutlet: UILabel!
 @IBOutlet weak var clicksButtonOutlet: UIButton!
 @IBOutlet weak var clicksOutlet: UILabel!
 @IBOutlet weak var cpsOutlet: UILabel!
 @IBOutlet weak var scoreOutlet2: UILabel!
 @IBOutlet weak var costOutlet: UILabel!
 @IBOutlet weak var cpsBtnOutlet: UIButton!

 override func prepare(for backsegue: UIStoryboardSegue, sender: Any?) 
 let controller = backsegue.destination as! ViewController
 controller.money = Int(scoreOutlet2.text!)!
 controller.clicks = Int(clicksOutlet.text!)!
 controller.CPS = Int(cpsOutlet.text!)!
 controller.cost = Int(cost)
 controller.cost2 = Int(cost2)
 

 override func viewDidLoad() 
 super.viewDidLoad()
 costOutlet2.isHidden = true
 costOutlet.isHidden = true
 costOutlet.text = "(cost)"
 scoreOutlet2.text = "(money)"
 clicksOutlet.text = "(clicks)"
 cpsOutlet.text = "(CPS)"
 errorLabel.isHidden = true
 clicksButtonOutlet.setTitle("$(cost): +1 Clicks", for: .normal)
 cpsBtnOutlet.setTitle("$(cost2): +1 CPS", for: . normal)
 

 override func viewDidAppear(_ animated: Bool) 
 scoreOutlet2.text = "(money)"
 clicksOutlet.text = "(clicks)"
 

 @IBAction func addClicks(_ sender: Any) 
 if (money >= cost) 
 money = money - cost
 scoreOutlet2.text = "(money)"
 cost = cost * 3
 clicks = clicks + 1
 clicksOutlet.text = "(clicks)"
 (sender as AnyObject).setTitle("$(cost): +1 Clicks", for:)
 print(cost)
 else 
 insufficent()
 
 

 @IBAction func addCps(_ sender: Any) 
 if (money >= cost2) 
 money = money - cost2
 scoreOutlet2.text = "(money)"
 cost2 = cost2 * 3
 CPS = CPS + 1
 cpsOutlet.text = "(CPS)"
 (sender as AnyObject).setTitle("$(cost2): +1 CPS", for:)
 else 
 insufficent()
 
 

 func insufficent() 
 errorLabel.isHidden = false
 errorLabel.text = "Insufficent Funds"
 DispatchQueue.main.asyncAfter(deadline: .now() + 3.5) 
 self.errorLabel.isHidden = true
 
 

I am currently trying to make a clicker game on Swift 4 Xcode 10, I am able to make the CPS increase when it is purchased, however, when it is bought the value of money does not go up every second. How can I make the variable "money" increase by whatever the value of "CPS" is.

Try to use the code in your viewController

/...
override func viewDidLoad() 
 super.viewDidLoad()
 increaseMoneyEverySecond()


private func increaseMoneyEverySecond() 
 money = money + CPS
 DispatchQueue.main.asyncAfter(deadline: .now()+1) [weak self] in
 if let strongSelf = self 
 strongSelf.increaseMoneyEverySecond()
 
 

/...