How to save highscore swift - swift

Question

I have been trying and searching for something that will help me for a long time but I haven't been able to find a solution yet. I am just trying to save a high score for the game that I am making but it always shows no errors and then gives me weird errors like "Thread 1: signal SIGABRT" when i try and run. Can anyone help me see what I am doing wrong?
import CoreMotion
import SpriteKit
enum CollisionTypes: UInt32{
case Player = 1
case Wall = 2
case Star = 4
case Vortex = 8
case Finish = 16
}
var levelsPassed = 0
var levelName = "level1"
class GameScene: SKScene, SKPhysicsContactDelegate {
var player: SKSpriteNode!
//hack so that we can test on the computer and then use on devises as well
var lastTouchPosition: CGPoint?
//create the motion manager
var motionManager: CMMotionManager!
//score labels
var scoreLabel: SKLabelNode!
var score: Int = 0 {
didSet {
scoreLabel.text = "Score: \(score)"
}
}
var highScoreLabel: SKLabelNode!
var highestScore:Int = 0
var gameOver = false
override func didMoveToView(view: SKView) {
/* Setup your scene here */
UIApplication.sharedApplication().idleTimerDisabled = true
let background = SKSpriteNode(imageNamed: "background.jpg")
background.position = CGPoint(x: 512, y: 384)
background.zPosition = -1
background.blendMode = .Replace
addChild(background)
NSUserDefaults.standardUserDefaults().setObject(highestScore, forKey:"HighestScore")
NSUserDefaults.standardUserDefaults().synchronize()
if (NSUserDefaults.valueForKey("HighestScore") != nil){
var savedScore: Int = NSUserDefaults.standardUserDefaults().objectForKey("HighestScore") as! Int
}
//call the loadLevel funciton
loadLevel(levelName)
createPlayer()
scoreLabel = SKLabelNode(fontNamed: "Chalkduster")
scoreLabel.text = "Score: 0"
scoreLabel.horizontalAlignmentMode = .Left
scoreLabel.position = CGPoint(x:32, y:100)
scoreLabel.zPosition = 2
addChild(scoreLabel)
highScoreLabel = SKLabelNode(fontNamed: "Chalkduster")
highScoreLabel.text = "Highscore: \(highestScore)"
highScoreLabel.horizontalAlignmentMode = .Left
highScoreLabel.position = CGPoint(x:225, y:100)
highScoreLabel.zPosition = 2
addChild(scoreLabel)
//give the game no gravity by default
physicsWorld.gravity = CGVector(dx: 0, dy: 0)
physicsWorld.contactDelegate = self
motionManager = CMMotionManager()
motionManager.startAccelerometerUpdates()
}

Answer 1

Try this code
import SpriteKit
class GameScene: SKScene {
var highScoreLabel: SKLabelNode!
var highestScore:Int = 0
var score = 0
override func didMoveToView(view: SKView) {
highScoreLabel = SKLabelNode(fontNamed: "Chalkduster")
highScoreLabel.text = "Highscore: \(highestScore)"
highScoreLabel.horizontalAlignmentMode = .Left
highScoreLabel.position = CGPoint(x:225, y:100)
highScoreLabel.zPosition = 2
addChild(highScoreLabel)
}
override func update(currentTime: NSTimeInterval) {
var highscore = 1
let userDefaults = NSUserDefaults.standardUserDefaults()
highscore = userDefaults.integerForKey("highscore")
userDefaults.setValue(highscore, forKey: "highscore")
if score > highscore {
userDefaults.setValue(score, forKey: "highscore")
}
highScoreLabel.text = "highscore: \(highscore)"
userDefaults.synchronize()
}
}