Swift - Saving highscore using NSUserDefaults

Question

I'm using Swift to make a game. I want to save the users high score using NSUserDefaults. I know how to create a new NSUserDefaults variable in my AppDelegate file:

let highscore: NSUserDefaults = NSUserDefaults.standardUserDefaults()

But how do I set/get this in my view controllers?

Answer 1

At first, NSUserDefaults is a dictionary (NSDictionary I think). Every app has its own user defaults, so you cannot access the user defaults from any other app.

If the user (the one who plays your game) makes a new highscore, you have to save that highscore like this:

let highscore = 1000
let userDefaults = NSUserDefaults.standardUserDefaults()
userDefaults.setValue(highscore, forKey: "highscore")
userDefaults.synchronize() // don't forget this!!!!

Then, when you want to get the best highscore the user made, you have to "read" the highscore from the dictionary like this:

if let highscore = userDefaults.valueForKey("highscore") {
    // do something here when a highscore exists
}
else {
    // no highscore exists
}

Answer 2

In Swift

let highScore = 1000
let userDefults = UserDefaults.standard //returns shared defaults object.

Saving:

userDefults.set(highScore, forKey: "highScore") //Sets the value of the specified default key to the specified integer value.

retrieving:

if let highScore = userDefults.value(forKey: "highScore") { //Returns the integer value associated with the specified key.
        //do something here when a highscore exists
    } else {
        //no highscore exists
}