Swift : Only transfers certain variable when using prepareforsegue function - swift

Question

I am using the prepareforsegue function to transfer data between view controllers. I am attempting to transfer the data held by 5 variables yet only 4 transfer. I am wondering if it is a formatting issue considering the 4 that transfer correctly have different variable types to the other. Any help would be greatly appreciated. Thank you for your time.
Sender View Controller
import Foundation
import UIKit
class CratesViewController : UIViewController {
var unlockedAK47 = "false"
var unlockedDesertEagle = "false"
var unlockedGlock17 = "false"
var unlockedGlock18 = "false"
var coinsAmount = 0
let screenSize: CGRect = UIScreen.main.bounds
#IBOutlet weak var coins: UILabel!
#IBOutlet weak var cratesImageView: UIImageView!
#IBOutlet weak var unlockView: UIView!
#IBOutlet weak var backButtonOutlet: UIButton!
#IBOutlet weak var gunImageView: UIImageView!
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
coins.text = String(coinsAmount)
gunImageView.isHidden = true
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "cratesToMainSegue" {
let destViewController = segue.destination as! ViewController
destViewController.unlockedAK47 = unlockedAK47
destViewController.unlockedDesertEagle = unlockedDesertEagle
destViewController.unlockedGlock17 = unlockedGlock17
destViewController.unlockedGlock18 = unlockedGlock18
destViewController.coinsAmount = coinsAmount
}
}
}
Destination View Controller
import UIKit
class ViewController: UIViewController {
var unlockedAK47 = "false"
var unlockedDesertEagle = "false"
var unlockedGlock17 = "true"
var unlockedGlock18 = "false"
struct defaultsKeys {
static let keyOne = ""
}
var coinsAmount = 100
#IBOutlet weak var coinsAmountLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Getting
let defaults = UserDefaults.standard
if let stringOne = defaults.string(forKey: defaultsKeys.keyOne) {
coinsAmount = Int(stringOne)!
}
coinsAmountLabel.text = String(coinsAmount)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Note that the segue identifiers have been set in the interface builder
if segue.identifier == "cratesSegue" {
let destViewController = segue.destination as! CratesViewController
destViewController.coinsAmount = coinsAmount
destViewController.unlockedAK47 = unlockedAK47
destViewController.unlockedDesertEagle = unlockedDesertEagle
destViewController.unlockedGlock17 = unlockedGlock17
destViewController.unlockedGlock18 = unlockedGlock18
} else if segue.identifier == "collectionSegue" {
let destViewController = segue.destination as! CollectionViewController
destViewController.coinsAmount = coinsAmount
destViewController.unlockedAK47 = unlockedAK47
destViewController.unlockedDesertEagle = unlockedDesertEagle
destViewController.unlockedGlock17 = unlockedGlock17
destViewController.unlockedGlock18 = unlockedGlock18
}
}
#IBAction func saveButton(_ sender: Any) {
coinsAmount = coinsAmount + 10
coinsAmountLabel.text = String(coinsAmount)
// Saving
let defaults = UserDefaults.standard
defaults.set(String(coinsAmount), forKey: defaultsKeys.keyOne)
}
}
Please let me know if any more information is needed. :)

Answer 1

This is not because coinsAmount is a different type. This is because coinsAmount's value is overwritten in viewDidLoad:
let defaults = UserDefaults.standard
if let stringOne = defaults.string(forKey: defaultsKeys.keyOne) {
coinsAmount = Int(stringOne)! <<<< HERE!
}
I think what you want to do is to get the coins amount only if it is not passed to ViewController.
You should declare coinsAmount as an optional:
var coinsAmount: Int!
And check whether it is nil before overwriting it, so that you don't accidentally overwrite the passed value.
if coinsAmount == nil {
let defaults = UserDefaults.standard
if let stringOne = defaults.string(forKey: defaultsKeys.keyOne) {
coinsAmount = Int(stringOne)!
}
}