How do I add Sprite based on score? - swift

Question

So far, I almost finished my game. I have a ball that falls due to gravity and the person taps it to make it bounce. Every time the sprite is tapped, +1 is added to the score. There are 3 balls in total that show up when the view loads.I want each ball to show up at a certain point mark(one ball shows up when the person reaches 10 points, another when the player reaches 20).
I tried putting this in update(currentTime: CFTimeInterval), but I end up with this:
(This is the secondball coming in at 10 points.)
Seems like there are an infinite number of balls until the person gets to 21 points which stops the never-ending cascade. If you tap the cascade though, it does pick a ball and makes it jump out which is sorta what I wanted.
This is GameScene.swift (excluding the update(CFTimeInterval) function)
import SpriteKit
class GameScene: SKScene {
var ball: Ball!
var secondball: Ball!
override func didMoveToView(view: SKView) {
//=======Ball 1=======//
let ball = Ball()
ball.position = CGPoint(x:self.frame.midX, y:440)
addChild(ball)
ball.physicsBody = SKPhysicsBody(circleOfRadius: 90)
ball.physicsBody?.dynamic = true
ball.physicsBody?.allowsRotation = false
ball.physicsBody?.friction = 0
ball.physicsBody?.angularDamping = 0
ball.physicsBody?.linearDamping = 0
ball.physicsBody?.usesPreciseCollisionDetection = true
ball.physicsBody!.categoryBitMask = 0
//======Ball 2======//
let secondball = Ball()
secondball.position = CGPoint(x:self.frame.midX * 1.65, y: 440)
addChild(secondball)
secondball.physicsBody = SKPhysicsBody(circleOfRadius: 90)
secondball.physicsBody?.dynamic = false
secondball.physicsBody?.allowsRotation = false
secondball.physicsBody?.friction = 0
secondball.physicsBody?.angularDamping = 0
secondball.physicsBody?.linearDamping = 0
secondball.physicsBody?.usesPreciseCollisionDetection = true
secondball.physicsBody!.categoryBitMask = 0
}
class Ball: SKSpriteNode {
init() {
let texture = SKTexture(imageNamed: "Ball")
super.init(texture: texture, color: .clearColor(), size: texture.size())
userInteractionEnabled = true
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let scene = self.scene as! GameScene
scene.score += 1
physicsBody?.velocity = CGVectorMake(0, 100)
physicsBody?.applyImpulse(CGVectorMake(0, 900))
}
}
override func update(currentTime: CFTimeInterval) {
if (score >= 10){
self.backgroundNode.texture = SKTexture(imageNamed: "orangebackground")
}
if (score >= 20){
self.backgroundNode.texture = SKTexture(imageNamed: "yellowbackground")
}
if (score >= 30) {
self.backgroundNode.texture = SKTexture(imageNamed: "greenbackground")
}
if (score >= 40){
self.backgroundNode.texture = SKTexture(imageNamed: "bluebackground")
}
if (score >= 50){
self.backgroundNode.texture = SKTexture(imageNamed: "darkbluebackground")
}
if (score >= 60){
self.backgroundNode.texture = SKTexture(imageNamed: "purplebackground")
}
if (score >= 70){
self.backgroundNode.texture = SKTexture(imageNamed: "brownbackground")
}
if (score >= 80) {
self.backgroundNode.texture = SKTexture(imageNamed: "maroonbackground")
}
if (score >= 90){
self.backgroundNode.texture = SKTexture(imageNamed: "tanbackground")
}
if (score >= 100){
self.backgroundNode.texture = SKTexture(imageNamed: "pinkbackground")
}
if (score >= 125) {
self.backgroundNode.texture = SKTexture(imageNamed: "bronzebackground")
}
if (score >= 150) {
self.backgroundNode.texture = SKTexture(imageNamed: "silverbackground")
}
if (score >= 175) {
self.backgroundNode.texture = SKTexture(imageNamed: "goldbackground")
}
if (score >= 200) {
self.backgroundNode.texture = SKTexture(imageNamed: "elitebackground")
}
}
}

Answer 1

The update method is called faster then the increased score. Therefore in every call of the update method a new ball is added.
Try something like this:
Move this line of code outside of the update method to make a global variable which has one ball instance:
let secondball = Ball()
Inside of update:
if (score == 10) && secondball.parent == nil {

Answer 2

You have choosed to control the touches part to the Ball class, this is possible but not convenient.
First of all give a name to your balls during the creation:
ball.name = "ball1"
self.addChild(ball)
...
secondball.name = "ball2"
secondball.alpha = 0.0 // hide your secondBall at start
self.addChild(secondball)
Then , move the touchesBegan from your Ball class, to your GameScene:
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first
let positionInScene = touch!.locationInNode(self)
let touchedNode = self.nodeAtPoint(positionInScene)
if let name = touchedNode.name {
switch name {
case "ball1": // if you're touching ball1
self.score += 1
ball.physicsBody?.velocity = CGVectorMake(0, 100)
ball.physicsBody?.applyImpulse(CGVectorMake(0, 900))
if score == 10 {
ball.removeFromParent()
// or make some animation like:
//let fadeOut=SKAction.fadeOutWithDuration(1.0)
//ball.runAction(fadeOut,completion: {
// self.ball.removeFromParent()
//})
secondball.alpha = 1
// or make some animation like:
//let fadeIn=SKAction.fadeInWithDuration(0.5)
//secondball.runAction(fadeIn,completion: {
// self.secondball.physicsBody?.dynamic = true
//})
secondball.physicsBody?.dynamic = true
}
case "ball2": // if you're touching ball2
self.score += 1
secondball.physicsBody?.velocity = CGVectorMake(0, 100) // here you can decrease parameters to more difficult
secondball.physicsBody?.applyImpulse(CGVectorMake(0, 900))
if score == 20 {
// do the same thing maked for ball to show other ball
}
case "ball3": // if you're touching ball3
self.score += 1
secondball.physicsBody?.velocity = CGVectorMake(0, 100) // here you can decrease parameters to more difficult
secondball.physicsBody?.applyImpulse(CGVectorMake(0, 900))
if score == 21 {
// do other stuff here
}
default:
break
}
}
}