I'm making a game with swift and spritekit and I have a function where I have multiple sprites falling from the top of the screen. I also made it so I can be able to detect a touch on the sprite using nodeAtPoint, and made it possible to flick the sprites. My problem is that due to nodeAtPoint dragging the deepest node in the tree, when i click and drag on a sprite, the newest sprite in the scene gets pulled toward my touch instead of the one i originally touched. If anyone has some suggestions on how to only affect the node I touched I'd really appreciate it.
class GameScene: SKScene {
var ball = SKSpriteNode(imagedNamed: "blueBlue")
var touchedNode: SKNode? = SKNode()
override func didMoveToView(view: SKView) {
var create = SKAction.runBlock({() in self.createTargets()})
var wait = SKAction.waitForDuration(2)
var waitAndCreateForever = SKAction.repeatActionForever(SKAction.sequence([create, wait]))
self.runAction(waitAndCreateForever)
}
func createTargets() {
ball = SKSpriteNode(imageNamed: "blueBlue")
let randomx = Int(arc4random_uniform(170) + 290)
ball.zPosition = 0
ball.physicsBody = SKPhysicsBody(circleOfRadius: ball.size.width / 11)
ball.physicsBody?.dynamic = true
ball.size = CGSize(width: ball.size.width / 1.5, height: ball.size.height / 1.5)
let random = Int(arc4random_uniform(35))
let textures = [texture1, texture2, texture3, texture4, texture5, texture6, texture7, texture8, texture9, texture10, texture11, texture12, texture13, texture14, texture15, texture16, texture17, texture18, texture19, texture20, texture21, texture22, texture23, texture24, texture25, texture1, texture7, texture18, texture24, texture25, texture1, texture7, texture18, texture24, texture25]
ball.texture = textures[random]
ball.position = CGPoint(x: randomx, y: 1400)
addChild(ball)
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
let touch = touches.first as! UITouch
let touchLocation = touch.locationInNode(self)
touchedNode = self.nodeAtPoint(touchLocation)
if touchedNode.frame.contains(touchLocation) {
touching = true
touchPoint = touchLocation
}
}
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
let touch = touches.first as! UITouch
let touchLocation = touch.locationInNode(self)
touching = true
touchPoint = touchLocation
}
override func update(currentTime: NSTimeInterval) {
if touching {
if touchPoint != touchedNode.position {
let dt: CGFloat = 0.1
let distance = CGVector(dx: touchPoint.x - touchedNode.position.x, dy: touchPoint.y - touchedNode.position.y)
let vel = CGVector(dx: distance.dx / dt, dy: distance.dy / dt)
if touchedNode.parent != nil {
touchedNode.physicsBody?.velocity = vel
}
}
}
}
}