Why this function stop working as soon as I add hit boxes? - swift

Question

I'm trying to crate a car game where you move the car from left to right by touching the screen but as soon as I set "physics definition -> body type" and the car reach the far left or the far right of the screen, this movement function stop working.
I'm using
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches{
let touchLocation = touch.location(in: self)
if touchLocation.x > centrePoint {
if playerCar.position.x == playerCarAtMaxLeft {
playerCar.position.x = playerCarAtLeft
playerCarMoveRight = true
playerCarMoveLeft = false
} else if playerCar.position.x == playerCarAtLeft {
playerCar.position.x = playerCarAtRight
playerCarMoveRight = true
playerCarMoveLeft = false
} else if playerCar.position.x == playerCarAtRight {
playerCar.position.x = playerCarAtMaxRight
playerCarMoveRight = true
playerCarMoveLeft = false
} else {
playerCarMoveRight = false
playerCarMoveLeft = true
}
} else {
if playerCar.position.x == playerCarAtMaxRight {
playerCar.position.x = playerCarAtRight
playerCarMoveRight = false
playerCarMoveLeft = true
} else if playerCar.position.x == playerCarAtRight {
playerCar.position.x = playerCarAtLeft
playerCarMoveRight = false
playerCarMoveLeft = true
} else if playerCar.position.x == playerCarAtLeft {
playerCar.position.x = playerCarAtMaxLeft
playerCarMoveRight = false
playerCarMoveLeft = true
} else{
playerCarMoveRight = true
playerCarMoveLeft = false
}
}
canMove = true
}
}
playerCar is a SKSpriteNode
playerCarAt... are CGFloat
playerCarMove... are Boolean

Answer 1

I'd suggest you just let the car slide on the x-axis as much as it wants and then use the update method to keep track of the cars position.
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
In that way you can set up let maxXPosition and as soon as the car-node hits that point, you stop the movement.
A way of doing so is to make the car-node movement an SKAction.moveTo.
A simple version would be:
class GameScene: SKScene {
var car : SKSpriteNode! // Your car sprite
var maxXPosition : CGFloat! // The max point on the x-axis the car is allowed to move to
override func didMove(to view: SKView) {
// Initiate car
car = self.childNode(withName: "//car") as? SKSpriteNode
// Setup the max x position
maxXPosition = 200
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self)
moveCar(toPosition: location)
}
}
override func update(_ currentTime: TimeInterval) {
// Check the cars position
if car.position.x >= 200 {
// Stop the car is the point has been reached
car.removeAction(forKey: "carDrive")
}
}
func moveCar(toPosition position: CGPoint) {
let moveCarToXPoint = SKAction.moveTo(x: position.x, duration: 1)
car.run(moveCarToXPoint, withKey: "carDrive")
}
}