Murturn Murturn - 11 days ago 7
Swift Question

didBeginContact not called

I am making a game in which I need my spriteNodes to collide. I followed a tutorial but it just isn't working for me.

When I run my game and two objects collide, there is no println("beginContact") in the output monitor, so the didBeginContact function isn't called.

override init(size:CGSize) {
super.init(size: size)
player.planeSprite = SKSpriteNode(imageNamed: "plane5")

player.planeSprite.physicsBody? = SKPhysicsBody(rectangleOfSize: player.planeSprite.size)
player.planeSprite.physicsBody?.dynamic = true;
player.planeSprite.physicsBody?.categoryBitMask = playerCategory;
player.planeSprite.physicsBody?.contactTestBitMask = noteCategory;
player.planeSprite.physicsBody?.collisionBitMask = 0;
player.planeSprite.physicsBody?.usesPreciseCollisionDetection = true;

player.planeSprite.position = CGPointMake(player.legalPositions[1], player.planeSprite.size.height/2)

self.addChild(player.planeSprite)
}

func addNote() {
var note:SKSpriteNode = SKSpriteNode(imageNamed: "note")
note.physicsBody? = SKPhysicsBody(rectangleOfSize: note.size)
note.physicsBody?.dynamic = true
note.physicsBody?.categoryBitMask = noteCategory
note.physicsBody?.contactTestBitMask = playerCategory
note.physicsBody?.collisionBitMask = 0

let minX = note.size.width/2
let maxX = self.frame.size.width - note.size.width/2
let rangeX = maxX - minX
let position = Int(arc4random_uniform(3))

note.position = CGPointMake(player.legalPositions[position], self.frame.size.height + note.size.height)

self.addChild(note)
}

func didBeginContact(contact: SKPhysicsContact!) {
println("beginContact")

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 & noteCategory) != 0 && (secondBody.categoryBitMask & playerCategory) != 0 ) {
println("if statement")
playerDidCollideWithNote(firstBody.node as SKSpriteNode, note: secondBody.node as SKSpriteNode)
}
}

func playerDidCollideWithNote(plane:SKSpriteNode, note:SKSpriteNode) {
println("hit")
note.removeFromParent()
}

Answer

Removing ? from the following statements will fix the issue.

player.planeSprite.physicsBody? = SKPhysicsBody(rectangleOfSize: player.planeSprite.size)

note.physicsBody? = SKPhysicsBody(rectangleOfSize: note.size)