Ios swift - Make difference between Contacts with categoryBitMask - ios

Question

I have a problem with my contact function.
My game consist to destroy balloons with two different colors : blue and yellow
At the moment my game works great but i want make a difference between color to count how many blue or yellow balloons i explosed.
I initialized as many categoryBitMask as I have colors and my projectil categoryBitMask too :
let blueCategory:UInt32 = 0x1 << 1 //color category
let yellowCategory:UInt32 = 0x1 << 1
let balloonCategory:UInt32 = 0x1 << 1 // general balloons category
let flechetteCategory:UInt32 = 0x1 << 0 // dart category
Balloon definitions :
func addBalloonbl(){
var balloonbl:SKSpriteNode = SKSpriteNode (imageNamed: "ballonbleu.png")
balloonbl.physicsBody = SKPhysicsBody (circleOfRadius: balloonbl.size.width/2)
balloonbl.physicsBody.dynamic = true
balloonbl.physicsBody.mass = 1
balloonbl.physicsBody.restitution = 1
balloonbl.physicsBody.categoryBitMask = balloonCategory | blueCategory
balloonbl.physicsBody.contactTestBitMask = flechetteCategory
balloonbl.physicsBody.collisionBitMask = balloonCategory
let minX = balloonbl.size.width/2
let maxX = self.frame.size.width - balloonbl.size.width/2
let rangeX = maxX - minX
let position:CGFloat = CGFloat(arc4random()) % CGFloat(rangeX) + CGFloat(minX)
balloonbl.position = CGPointMake(position, self.frame.size.height+balloonbl.size.height)
self.addChild(balloonbl)
}
func addBalloonj(){
var balloonj:SKSpriteNode = SKSpriteNode (imageNamed: "ballonjaune.png")
balloonj.physicsBody = SKPhysicsBody (circleOfRadius: balloonj.size.width/2)
balloonj.physicsBody.dynamic = true
balloonj.physicsBody.mass = 1
balloonj.physicsBody.restitution = 1
balloonj.physicsBody.categoryBitMask = balloonCategory | yellowCategory
balloonj.physicsBody.contactTestBitMask = flechetteCategory
balloonj.physicsBody.collisionBitMask = balloonCategory
let minX = balloonj.size.width/2
let maxX = self.frame.size.width - balloonj.size.width/2
let rangeX = maxX - minX
let position:CGFloat = CGFloat(arc4random()) % CGFloat(rangeX) + CGFloat(minX)
balloonj.position = CGPointMake(position, self.frame.size.height+balloonj.size.height)
self.addChild(balloonj)
}
My contact function :
func didBeginContact(contact: SKPhysicsContact!)
{
var firstBody: SKPhysicsBody
var secondBody: SKPhysicsBody
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask)
{
firstBody = contact.bodyA
secondBody = contact.bodyB
}
else
{
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if ((firstBody.categoryBitMask & flechetteCategory) != 0 && (secondBody.categoryBitMask & blueCategory) != 0)
{
flecheDidCollideWithBlueBalloon(firstBody.node as SKSpriteNode, balloon: secondBody.node as SKSpriteNode)
}
else if ((firstBody.categoryBitMask & flechetteCategory) != 0 && (secondBody.categoryBitMask & yellowCategory) !=0)
{
flecheDidCollideWithYellowBalloon(firstBody.node as SKSpriteNode, balloon: secondBody.node as SKSpriteNode)
}
}
func flecheDidCollideWithBlueBalloon (fleche: SKSpriteNode, balloon: SKSpriteNode)
{
self.runAction(SKAction.playSoundFileNamed("eclate.mp3", waitForCompletion: false))
println("blue")
fleche.removeFromParent()
balloon.removeFromParent()
balloonDestroyed++
}
func flecheDidCollideWithBYellowBalloon (fleche: SKSpriteNode, balloon: SKSpriteNode)
{
self.runAction(SKAction.playSoundFileNamed("eclate.mp3", waitForCompletion: false))
println("Yellow")
fleche.removeFromParent()
balloon.removeFromParent()
balloonDestroyed++
}
with this code, I can destroy both balloon colors but when I destroy a yellow one func flecheDidCollideWithBlueBalloon is called instead flecheDidCollideWithYellowBalloon.
"blue" is post on the console display...
Any idea?
Thank you a lot !!

Answer 1

Some of your category variables have the same value:
let blueCategory:UInt32 = 0x1 << 1 //color category
let yellowCategory:UInt32 = 0x1 << 1
let balloonCategory:UInt32 = 0x1 << 1 // general balloons category
Since you are combining some of these flags in the same bitmask variable, they are conflicting with each other.
They need to have different values:
let blueCategory:UInt32 = 0x1 << 1 //color category
let yellowCategory:UInt32 = 0x1 << 2
let balloonCategory:UInt32 = 0x1 << 3 // general balloons category