Using UserDefaults to store score for a clicker game (Swift 5)

Question

Have made a simple incremental game. I want it so that even if I go to a different VC and then return to the game, or reopen the game, it will show the current score. My issue is that if I leave the game, then the score will return back to zero. I do not want that to happen. The score should not be resetting. I've heard I could use UserDefaults but I am not familiar to it at all. If you can explain using code, that would be best. Thanks.

import UIKit

class CookieClickerVC: UIViewController {

@IBOutlet weak var goldLabel: UILabel!
@IBOutlet weak var numberOfGold: UILabel!
@IBOutlet weak var getGoldButton: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()
    formatItems()
    let defaults = UserDefaults.standard
    defaults.set(0, forKey: "goldCount")

}



@IBAction func getGoldClicked(_ sender: Any) {
    goldCount += 1
    numberOfGold.text = ("\(goldCount)")
}`

also, you may have already figured out, but goldCount is an unresolved identifier. How should I change the code after button is clicked?

Answer 1

Step 1: declare your goldCount variable and set the initial value to 0

Step 2: on viewDidLoad, get the value stored in the UserDefaults and set it to goldCount

Step 3: Also update your label

Step 4: Update the value of goldCount in userDefaults

import UIKit

class CookieClickerVC: UIViewController {

    @IBOutlet weak var goldLabel: UILabel!
    @IBOutlet weak var numberOfGold: UILabel!
    @IBOutlet weak var getGoldButton: UIButton!

    //Step1: declare your goldCount variable and set initial value to 0
    var goldCount = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        formatItems()
        //Step2: on viewDidLoad, get the value stored in the UserDefaults and set it to goldCount
        goldCount = UserDefaults.standard.integer(forKey: "goldCount")
        //Step3: then also update your label
        numberOfGold.text = ("\(goldCount)")


    }

    @IBAction func getGoldClicked(_ sender: Any) {
        goldCount += 1
        numberOfGold.text = ("\(goldCount)")
        //Step4: update the value of goldCount in userDefaults
        UserDefaults.standard.set(goldCount, forKey: "goldCount")
    }
}