I want to detect in my app a contact between two objects. I have an enum to define the different types:
enum ColliderType: UInt32 {
case Ball = 0b010
case Object = 0b001
case Gap = 0b100
}
I also added SKPhysicsContactDelegate to my SKView:
In didMoveToView, I have
self.physicsWorld.contactDelegate = self
So here are my objects that I defined
ball = SKSpriteNode(texture: ballTexture)
ball.position = CGPoint(x: CGRectGetMidX(self.frame) - self.frame.width/12, y: self.frame.size.height - (self.frame.size.height - 100))
ball.physicsBody = SKPhysicsBody(circleOfRadius: ballTexture.size().height)
ball.physicsBody!.dynamic = false
ball.physicsBody?.allowsRotation = false
ball.physicsBody!.categoryBitMask = ColliderType.Ball.rawValue
ball.physicsBody!.contactTestBitMask = ColliderType.Object.rawValue
ball.physicsBody!.collisionBitMask = ColliderType.Object.rawValue
let boxTexture = SKTexture(imageNamed: "Obstacle.png")
let box1 = SKSpriteNode(texture: boxTexture)
box1.size = CGSizeMake(self.frame.width/4, self.frame.width/8)
box1.runAction(moveAndRemoveBoxes)
box1.physicsBody = SKPhysicsBody(rectangleOfSize: box1.size)
box1.physicsBody!.dynamic = false
box1.physicsBody!.categoryBitMask = ColliderType.Object.rawValue
box1.physicsBody!.contactTestBitMask = ColliderType.Ball.rawValue
box1.physicsBody!.collisionBitMask = ColliderType.Object.rawValue
let gap = SKSpriteNode()
gap.size = box1.size
gap.physicsBody = SKPhysicsBody(rectangleOfSize: box1.size)
gap.physicsBody!.dynamic = false
gap.physicsBody!.categoryBitMask = ColliderType.Gap.rawValue
gap.physicsBody!.contactTestBitMask = ColliderType.Ball.rawValue
gap.physicsBody!.collisionBitMask = ColliderType.Gap.rawValue
In the didBeginContact function I have:
func didBeginContact(contact: SKPhysicsContact) {
if contact.bodyA.categoryBitMask == ColliderType.Gap.rawValue || contact.bodyB.categoryBitMask == ColliderType.Gap.rawValue {
print("score")
score++
scoreLabel.text = String(score)
} else {
if gameOver == false {
gameOver = true
self.speed = 0
}
}
}
If you tap the screen the ball objects jumps from half of the screen to other, and the object called box1 is "falling down" on one half of the screen and the "invisible" gap to detect if the player passed without colliding with the box is on the other half of the screen. So I want to detect if the ball touches the gap, so that the players score, otherwise the ball collides with the box
This is because your obstacles contactTestBitMask is looking for Object, not Ball. You want this: box1.physicsBody!.contactTestBitMask = ColliderType.Ball.rawValue
In light of the new changes:
ball.physicsBody!.contactTestBitMask = ColliderType.Object.rawValue | ColliderType.Gap.rawValue
You need to be checking for gap value if you want contact to work