In swift for sprite kit, how can I have a functionality that tracks the touches of two nodes and at a time? Along with tracking the textures? - swift

Question

I’m working on a matching game. In my app, I would like a functionality that tracks the touches of two nodes at time. When the user touches the nodes and if the textures displayed after the user touches the nodes match; I don’t want the user to be able to interact with the two nodes anymore.
However, if the textures displayed after the user touches the two nodes do not match. I want the two nodes the user touched to reset back to their original position before the user touched the nodes.
For example, let’s say the user touches the node named “fruit match card1” and it displays the texture of an “apple” then they touch the node named “fruit match card 2” and it also displays the texture of an “apple”. Since, these two nodes display the same texture that match. I don’t want the user to be able to interact with those nodes anymore since they clicked nodes that display the same texture.
However, let’s say the user touched the node named “Fruit match card 1” and it displays the “Apple” texture. Then they touched the node named “Fruit match Card 3” and it displays the “Grapes” texture. Since, these two nodes do not display the same texture I want those nodes to reset back to their original position before the user touched them.
Any advice or help on how I can have those kind of functionalities in my app? Basically having a functionality that tracks the touches of two nodes at a time and also a functionality that will reset the nodes back to their original position of the textures of the two nodes touched do not match? Thanks!
Here is my current code:
import Foundation
import SpriteKit
class EasyScreen: SKScene {
override func didMove(to view: SKView) {
var background = SKSpriteNode(imageNamed: "Easy Screen Background")
let timerText = SKLabelNode(fontNamed: "Arial")
timerText.fontSize = 40
timerText.fontColor = SKColor.white
timerText.position = CGPoint(x: 20, y: 400)
timerText.zPosition = 1
var counter:Int = 90
timerText.run(SKAction.repeatForever(SKAction.sequence([SKAction.run {
counter-=1
timerText.text = " Time: \(counter)"
print("\(counter)")
if counter <= 0{
let newScene = TryAgainScreen(fileNamed: "Try Again Screen")
newScene?.scaleMode = .aspectFill
self.view?.presentScene(newScene)
}
},SKAction.wait(forDuration: 1)])))
background.position = CGPoint(x: 0, y: 0)
background.size.width = self.size.width
background.size.height = self.size.height
background.anchorPoint = CGPoint(x: 0.5,y: 0.5)
let matchCardOne = SKSpriteNode(imageNamed: "Fruit Match Card")
let matchCardTwo = SKSpriteNode(imageNamed: "Fruit Match Card")
let matchCardThree = SKSpriteNode(imageNamed: "Fruit Match Card")
let matchCardFour = SKSpriteNode(imageNamed: "Fruit Match Card")
let soundButton = SKSpriteNode(imageNamed: "Sound On")
matchCardOne.name = "FruitMatchCard1"
matchCardTwo.name = "FruitMatchCard2"
matchCardThree.name = "FruitMatchCard3"
matchCardFour.name = "FruitMatchCard4"
soundButton.name = "Sound"
matchCardOne.size = CGSize(width: 150, height: 300)
matchCardTwo.size = CGSize(width: 150, height: 300)
matchCardThree.size = CGSize(width: 150, height: 300)
matchCardFour.size = CGSize(width: 150, height: 300)
soundButton.size = CGSize(width: 75, height: 75)
matchCardOne.zPosition = 1
matchCardTwo.zPosition = 1
matchCardThree.zPosition = 1
matchCardFour.zPosition = 1
soundButton.zPosition = 3
matchCardOne.anchorPoint = CGPoint(x: 0.5, y: 0.5)
matchCardTwo.anchorPoint = CGPoint(x: 0.5, y: 0.5)
matchCardThree.anchorPoint = CGPoint(x: 0.5, y: 0.5)
matchCardFour.anchorPoint = CGPoint(x: 0.5, y: 0.5)
soundButton.anchorPoint = CGPoint(x: 0.5, y: 0.5)
matchCardOne.position = CGPoint(x: -125, y: 60)
matchCardTwo.position = CGPoint(x: -125, y: -260)
matchCardThree.position = CGPoint(x: 70, y: 60)
matchCardFour.position = CGPoint(x: 70 , y: -260)
soundButton.position = CGPoint(x: -180, y: -600)
addChild(background)
addChild(matchCardOne)
addChild(matchCardTwo)
addChild(matchCardThree)
addChild(matchCardFour)
addChild(timerText)
addChild(soundButton)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.view?.isMultipleTouchEnabled = false
let touch = touches.first
let positionInSceneOne = touch!.location(in: self)
let tappedNodes = nodes(at: positionInSceneOne)
for node in tappedNodes{
if let tappedCard = node as? SKSpriteNode {
if tappedCard.name == "FruitMatchCard1" {
tappedCard.texture = SKTexture(imageNamed: "Apple")
}
}
}
let touchTwo = touches.first
let positionInSceneTwo = touch!.location(in: self)
let tappedNodesTwo = nodes(at: positionInSceneTwo)
for node in tappedNodesTwo{
if let tappedCard = node as? SKSpriteNode {
if tappedCard.name == "FruitMatchCard2" {
tappedCard.texture = SKTexture(imageNamed: "Apple")
}
}
}
let touchThree = touches.first
let positionInSceneThree = touch!.location(in: self)
let tappedNodesThree = nodes(at: positionInSceneThree)
for node in tappedNodesThree{
if let tappedCard = node as? SKSpriteNode {
if tappedCard.name == "FruitMatchCard3" {
tappedCard.texture = SKTexture(imageNamed: "Grapes")
}
}
}
let touchFour = touches.first
let positionInSceneFour = touch!.location(in: self)
let tappedNodesFour = nodes(at: positionInSceneFour)
for node in tappedNodesFour{
if let tappedCard = node as? SKSpriteNode {
if tappedCard.name == "FruitMatchCard4" {
tappedCard.texture = SKTexture(imageNamed: "Grapes")
}
}
}
}

Answer 1

You don't want to track the textures.
The texture i.e. the image of the node is just a representation of some state that the node is in, so you need to track the node's state instead.
You could do this by either having an array of nodes and their state but a better way is to subclass SKSpriteNode to create your card node and then add a custom bool property for isFaceUp, which will make it much easier to decide if cards can be touched or matched etc.