How to save a high score with SpriteKit? - ios

Question

Im starting to learn how to code and i have no clue how to save the score to stay as a high score. any help will be appreciated! i already tried and tried but i can't manage to get it right. at this point i don't know what to do.
class Game: SKScene, SKPhysicsContactDelegate {
let Ball = SKSpriteNode(imageNamed: "Red.png")
var QuitOption = SKLabelNode()
var ScoreLabel = SKLabelNode()
var timesecond = Int(60)
var locked = false
var loseOption = SKLabelNode()
var scorePoints = SKLabelNode()
var score = Int()
var highScore = SKLabelNode()
let whiteBall = SKSpriteNode(imageNamed: "fingerPointingDown.png")
struct PhysicsCategory {
static let Ball: UInt32 = 0b1
static let whiteBall: UInt32 = 0b10
}
override func didMoveToView(view: SKView) {
backgroundColor = SKColor.whiteColor() // background for the display
self.physicsWorld.gravity = CGVectorMake(0, -9.8)
self.physicsWorld.contactDelegate = self
let SceneBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
SceneBody.friction = 0
self.physicsBody = SceneBody
scorePoints = SKLabelNode(fontNamed: "Noteworthy-Light")
scorePoints.text = "0"
scorePoints.fontColor = SKColor.blackColor()
scorePoints.fontSize = 35
scorePoints.position = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height*1 - 120)
scorePoints.name = "Points"
scorePoints.hidden = true
addChild(scorePoints)
Ball.size = CGSize(width: 82, height: 82)
Ball.position = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height*0.1 - 60)
Ball.physicsBody = SKPhysicsBody(circleOfRadius: 41)
Ball.physicsBody?.affectedByGravity = true
Ball.physicsBody?.density = 10
Ball.physicsBody?.restitution = 0.1
Ball.physicsBody?.linearDamping = 0
Ball.name = "Ball"
Ball.physicsBody?.usesPreciseCollisionDetection = true
Ball.physicsBody?.categoryBitMask = PhysicsCategory.Ball
Ball.physicsBody?.contactTestBitMask = PhysicsCategory.whiteBall
Ball.physicsBody?.collisionBitMask = PhysicsCategory.whiteBall
self.addChild(Ball)
QuitOption.text = "Quit"
QuitOption.fontName = "Noteworthy-Light"
QuitOption.fontColor = SKColor.purpleColor()
QuitOption.fontSize = 35
QuitOption.position = CGPoint(x: self.frame.size.width/2 - 160, y: self.frame.size.height*1 - 110)
QuitOption.name = "Quit"
addChild(QuitOption)
ScoreLabel = SKLabelNode(fontNamed: "Noteworthy-Light")
ScoreLabel.fontColor = SKColor.redColor()
ScoreLabel.fontSize = 35 // The + will move it to the right side and - to the left side for more accuracy.
ScoreLabel.position = CGPoint(x: self.frame.size.width/2 + 160, y: self.frame.size.height/1 - 115) // position of ScoreLabelNode
ScoreLabel.name = "Score+"
ScoreLabel.hidden = false
self.addChild(ScoreLabel)
whiteBall.size = CGSize(width: 55, height: 55)
whiteBall.position = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height*0.8 - 30)
whiteBall.name = "whiteBall"
whiteBall.physicsBody = SKPhysicsBody(circleOfRadius: 25)
whiteBall.physicsBody?.dynamic = false
whiteBall.physicsBody?.restitution = 0.1
whiteBall.physicsBody?.usesPreciseCollisionDetection = true
whiteBall.physicsBody?.categoryBitMask = PhysicsCategory.whiteBall
whiteBall.physicsBody?.contactTestBitMask = PhysicsCategory.Ball
whiteBall.physicsBody?.collisionBitMask = PhysicsCategory.Ball
self.addChild(whiteBall)
}
// Making the ball jump after user touches ball
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
var touch = touches.first as! UITouch
var location = touch.locationInNode(self)
var node = self.nodeAtPoint(location)
if (node.name == "Quit"){
let myScene = GameScene(size: self.size)
myScene.scaleMode = scaleMode
let reveal = SKTransition.fadeWithDuration(1)
self.view?.presentScene(myScene, transition: reveal)
}
if (node.name == "Ball"){
for touch: AnyObject in touches {
Ball.physicsBody?.allowsRotation = true
Ball.physicsBody?.velocity = CGVectorMake(0, 0)
Ball.physicsBody?.applyImpulse(CGVectorMake(0, 450))
}
}
if(!self.locked){
self.locked = true
var actionrun = SKAction.waitForDuration(0.5)
var actionwait = SKAction.runBlock({
self.timesecond--
if self.timesecond == 60 {self.timesecond = 0}
self.ScoreLabel.text = "\(self.timesecond)"
if (self.timesecond == 0){
let myScene = WT(size: self.size)
myScene.scaleMode = self.scaleMode
let reveal = SKTransition.fadeWithDuration(1)
self.view?.presentScene(myScene, transition: reveal)
}
})
let loopAction = SKAction.repeatAction(SKAction.sequence([actionwait, actionrun]), count: 60)
ScoreLabel.runAction(loopAction, withKey: "scoreAction")
}
}
func didBeginContact(contact: SKPhysicsContact) {
let collision = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask
if collision == PhysicsCategory.Ball | PhysicsCategory.whiteBall {
score++
scorePoints.text = "Score: \(score)"
scorePoints.hidden = false
}
}
}

Answer 1

The simplest way is to use NSUserDefaults.
NSUserDefaults.standardUserDefaults().setInteger(highScore, forKey: "high_score")
NSUserDefaults.synchronize() // must be used to save
You can then load the score when needed
let highScore: Int = NSUserDefaults.standardUserDefaults().integerForKey("high_score")
You can access NSUserDefaults from anywhere, saving and loading as needed.
If you have more global player state, create an object for it and you could serialize the object by making it conform to NSCoding protocol.
You would need to implement the encode and decode functions, that save aand load your object's properties.