leaderboard with persistent data in swift using usersdefault to save the values - ios

Question

I'm trying to create a leaderboard, but the player names and scores are not permanently saved, the "leaderboard" only contains the data from the most recent game in its text view. I tried making arrayOfData initially hold playerName and finalScore instead of being an empty array, but the problem still remains. How can I display playerName and playerScore in the leaderboard permanently and hove more names and scores added as more people play?
var finalScore = Int()
var playerName = String()
var allMyStoredData = UserDefaults.standard
var arrayOfData: [Any] = []
class secondVC: UIViewController {
#IBOutlet weak var scoreLabel: UILabel!
#IBOutlet weak var nameTF: UITextField!
#IBOutlet weak var doneButton: UIButton!
var playerScore = 0
var arrayOfData: [Any] = []
override func viewDidLoad() {
super.viewDidLoad()
scoreLabel.text = "Your score is: \(finalScore)"
loadData()
}
#IBAction func donePressed(_ sender: Any) {
saveData()
performSegue(withIdentifier: "toLeaderboard", sender: self)
}
func saveData () {
playerName = nameTF.text!
playerScore = finalScore
arrayOfData.append(playerName)
arrayOfData.append(playerScore)
allMyStoredData.set(playerName, forKey: "saveTheName")
allMyStoredData.set(playerScore, forKey: "saveTheScore")
allMyStoredData.set(arrayOfData, forKey: "saveTheArray")
}
func loadData () {
if let loadPlayerName:String = UserDefaults.standard.value(forKey: "saveTheName") as? String {
playerName = loadPlayerName
}
if let loadTheScore:Int = UserDefaults.standard.value(forKey: "saveTheName") as? Int {
playerScore = loadTheScore
}
}
}
//this is the code in the leaderboard's view controller
class leaderboardViewController: UIViewController {
#IBOutlet weak var theTextView: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
theTextView.text = "\((arrayOfData).map{"\($0)"}.joined(separator: " Score: "))"
}
}

Answer 1

You are overwriting your saveTheArray item UserDefaults each time with a new array.
You want to fetch the saved array first, append the new game data, then re-save as so:
//Create user defaults instance
let userDefaults = UserDefaults.standard
//User defaults key
let historicalGameDataKey = "historicalGameData"
//Fetch game data array
var historicalGameData = userDefaults.array(forKey: historicalGameDataKey)
//Create array if it is nil (i.e. very first game)
if historicalGameData == nil {
historicalGameData = []
}
//Create game data dictionary
let gameData = [
"playerName": playerName,
"playerScore": playerScore
]
//Append game data dictionary to the array
historicalGameData?.append(["playerName": gameData])
//Save the updated array
userDefaults.set(historicalGameData, forKey: historicalGameDataKey
Core Data would be a better way to store this data, but this example should solve your problem using UserDefaults.