Swift - Saving Highscore Using Nsuserdefaults

How to save a highscore to a game in swift with UserDefaults?

Try this

func saveHighScore() {
UserDefaults.standard.set(score, forKey: "HIGHSCORE")
}

Saving highscore with NSUserDefaults

In the code you gave, you are setting "Highscore" when updating, but are attempting to get the value for "HighScore" (Notice the capital S)

This line:

if (highScoreDefault.valueForKey("HighScore") != nil){

Change it to:

if (highScoreDefault.valueForKey("Highscore") != nil){

Nsuserdefaults highscore saving

Change viewDidLoad to:

override func viewDidLoad() {
    super.viewDidLoad()

    if let hscore = defaults.valueForKey("highscore") {
        highscore = hscore
        highScoreResult.text = String(hscore)
    }
}

That should load the highscore from the defaults once you're app launches.

Saving highscores with NSUserDefaults

Use NSCoding. Create a Swift file "HighScore"

import Foundation

class HighScore: NSObject {

    var highScore: Int = 0

    func encodeWithCoder(aCoder: NSCoder!) {
           aCoder.encodeInteger(highScore, forKey: "highScore")
    }

    init(coder aDecoder: NSCoder!) {
        highScore = aDecoder.decodeIntegerForKey("highScore")
    }

    override init() {
    }
}

class SaveHighScore:NSObject {

    var documentDirectories:NSArray = []
    var documentDirectory:String = ""
    var path:String = ""

    func ArchiveHighScore(#highScore: HighScore) {
        documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        documentDirectory = documentDirectories.objectAtIndex(0) as String
        path = documentDirectory.stringByAppendingPathComponent("highScore.archive")

        if NSKeyedArchiver.archiveRootObject(highScore, toFile: path) {
            println("Success writing to file!")
        } else {
            println("Unable to write to file!")
        }
    }

    func RetrieveHighScore() -> NSObject {
        var dataToRetrieve = HighScore()
        documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        documentDirectory = documentDirectories.objectAtIndex(0) as String
        path = documentDirectory.stringByAppendingPathComponent("highScore.archive")
        if let dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? HighScore {
            dataToRetrieve = dataToRetrieve2
        }
        return(dataToRetrieve)
    }
}

Then for your ViewController:

   import UIKit


    class ViewController: UIViewController, UITextFieldDelegate {
        var Score = HighScore()

        override func viewDidLoad() {
            super.viewDidLoad()

        Score.highScore = 100
        SaveHighScore().ArchiveHighScore(highScore: Score)
        var retrievedHighScore = SaveHighScore().RetrieveHighScore() as HighScore
        println(retrievedHighScore.highScore)

        }
    }

save a highscore with UserDefaults in Swift 3

You still haven't clearly explained what problem you're seeing, but my guess is that your high score doesn't appear to be saved across restarts of the app.

The problem is that you initialize fastestScore to 100000000000000.0 when your ThirdViewController is created. You don't load it from UserDefaults. Thus even if there is a stored fastestScore, you don't load it at launch.

You should fix this with two changes. First, in your application delegate, you should register a default high score:

let bestScoreKey = "bestScore"

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, willFinishLaunchingWithOptions options: [UIApplicationLaunchOptionsKey : Any]?) -> Bool {
        UserDefaults.standard.register(defaults: [
            bestScoreKey: 1_000_000_000.0
        ])
        return true
    }

}

You should also register any other default settings there.

Second, in ThirdViewController, you should initialize fastestScore from UserDefaults. You can also save changes back to UserDefaults in the property's didSet observer:

    var fastestScore: Double = UserDefaults.standard.double(forKey: bestScoreKey) {
        didSet {
            UserDefaults.standard.set(fastestScore, forKey: bestScoreKey)
        }
    }

Other tips:

• There is no reason to make fastestScore a Float if your scores are Double. Just save it as a Double.

• Don't repeat string keys. The compiler won't catch your spelling errors. Put the key in a constant like I did with bestScoreKey.

• You can use _ in long numbers to make them more readable.

• Insulting your player is a questionable marketing strategy. How would you have felt if the first comment on your question was “Seriously? Are you even trying?”

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