Save score in a game with NSUserdefaults - ios

Question

I've made this little app "How many fingers" where the user has to guess how many fingers the computer is holding behind it's back. Now I want it to be able to save the users score with NSUserdefaults, but it's not working. Here is how my code looks right now:
//
// ViewController.swift
// How many Fingers?
//
// Created by Kevin Nguyen on 02.05.15.
// Copyright (c) 2015 Kevin Nguyen. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
#IBOutlet var userGuess: UITextField!
#IBOutlet var userScore: UILabel!
#IBOutlet var userTotal: UILabel!
#IBOutlet var result: UILabel!
var score:Int = 0
var totalGames:Int = 0
#IBAction func resetScore(sender: AnyObject) {
score = 0
userScore.text = "0"
}
#IBAction func start(sender: AnyObject) {
var userGuessInt = userGuess.text.toInt()
var fingers = Int(arc4random_uniform(6))
if userGuessInt <= 5 {
if userGuessInt == fingers {
result.text = "Great! You were right!"
score++
totalGames++
userScore.text = "\(score)"
userTotal.text = "\(totalGames)"
println("User score is \(score); total games is \(totalGames)")
NSUserDefaults.standardUserDefaults().setObject(score, forKey: "svScore")
NSUserDefaults.standardUserDefaults().setObject(totalGames, forKey: "svTotalGames")
} else {
result.text = "Try Again!"
println("User score is \(score); total games is \(totalGames)")
totalGames++
userTotal.text = "\(totalGames)"
NSUserDefaults.standardUserDefaults().setObject(score, forKey: "svScore")
NSUserDefaults.standardUserDefaults().setObject(totalGames, forKey: "svTotalGames")
}
} else{
result.text = "Enter a number from 0 up to 5!"
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if score != 0 {
var score:Int = NSUserDefaults.standardUserDefaults().objectForKey("svScore")! as! Int
userScore.text = "\(score)"
}
if totalGames != 0 {
var totalGames:Int = NSUserDefaults.standardUserDefaults().objectForKey("svTotalGames")! as! Int
userTotal.text = "\(totalGames)"
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

When your application starts the score in viewDidLoad is always 0. So you'll never read the saved data (because of your if condition). You should also check it there is data stored before you try to use it.
Change it like that:
override func viewDidLoad() {
super.viewDidLoad()
if (NSUserDefaults.standardUserDefaults().objectForKey("svScore") != nil) {
score = NSUserDefaults.standardUserDefaults().objectForKey("svScore")! as! Int
}
if score != 0 {
userScore.text = "\(score)"
}
if (NSUserDefaults.standardUserDefaults().objectForKey("svTotalGames") != nil) {
totalGames = NSUserDefaults.standardUserDefaults().objectForKey("svTotalGames")! as! Int
}
if totalGames != 0 {
userTotal.text = "\(totalGames)"
}
}

Answer 2

//To Save Highscore
NSUserDefaults.standardUserDefaults().setInteger(highScore, forKey: "highscore")
//To Call For Highscore
var highScore:Int = NSUserDefaults.standardUserDefaults().integerForKey("highscore")

Answer 3

You could create a HighscoreSaver-util class like that:
class HighscoreSaver {
private let defaults = NSUserDefaults.standardUserDefaults()
private let highscoreKey = "highscore-saver-key-item"
private var highscore:Int = 0
private func updateHighscore(score:Int){
highscore += score
if defaults.integerForKey(highscoreKey) < highscore{
defaults.setInteger(highscore, forKey: highscoreKey)
}
}
func add(score scoreToAdd:Int){
updateHighscore(scoreToAdd)
}
func reset(){
defaults.removeObjectForKey(highscoreKey)
}
func currentHighscore() -> Int{
return highscore
}
}
The usage would be like that:
var high = HighscoreSaver()
//Adds scorevalue to current score
high.add(score: yourScoreToAddToCurrent)
//Resets the score to 0
high.reset()
//Gets current score
high.currentHighscore()