iOS Swift didBeginContact not being called - swift

Question

I have been struggling for the past two days to get two SKSpriteNodes to register a collision and evoke didBegin#contact.
I've set their bit masks 'categoryBitMask', 'contactTestBitMask' and 'collisionTestBitMask' for both objects.
I've also set the 'dynamic' property for both to 'true'
initPhysics() seems to set up the physicsWorld okay.
All I'm expecting is that didBegin#Contact is called, but it is not
//Set up Physicsbody bit masks
let playerCarBitMask: UInt32 = 0x1 << 1
let slowCarBitMask: UInt32 = 0x1 << 2
//initPhysics
func initPhysics() {
println("(((((((((((((( Initiating Physicsbody ))))))))))))))")
self.physicsWorld.contactDelegate = self
self.physicsWorld.gravity = CGVector.zeroVector
println("self.physicsWorld.contactDelegate = \(self.physicsWorld.contactDelegate)")
}
//setupPlayer
func setupPlayer() {
car = SKSpriteNode(imageNamed: "redCarUp")
car.setScale(2.0)
car.position = CGPoint(x: 800, y: 400)
car.zPosition = 100
car.name = "car"
gameNode.addChild(car)
let carBody = SKPhysicsBody(
rectangleOfSize: car.frame.size, center: car.position)
carBody.dynamic = true
carBody.categoryBitMask = playerCarBitMask
carBody.contactTestBitMask = slowCarBitMask
carBody.mass = 5
carBody.collisionBitMask = slowCarBitMask
car.physicsBody = carBody
println("carBody = \(carBody)")
println("carBody.dynamic = \(carBody.dynamic)")
println("carBody.mass = \(carBody.mass)")
println("carBody.categoryBitMask = \(carBody.categoryBitMask)")
println("carBody.contactTestBitMask = \(carBody.contactTestBitMask)")
println("carBody.collisionBitMask = \(carBody.contactTestBitMask)")
slowCar = SKSpriteNode(imageNamed: "blueCarUp")
slowCar.setScale(2.0)
let slowCarScenePos = CGPoint(
x: 680,
y: 2048)
slowCar.position = gameNode.convertPoint(slowCarScenePos, fromNode: self)
println("slowCar.position = \(slowCar.position) ****")
slowCar.zPosition = 80
slowCar.name = "slowCar"
let slowCarBody = SKPhysicsBody(
rectangleOfSize: slowCar.frame.size, center: slowCar.position)
println("slowCar = \(slowCar) ****")
slowCarBody.dynamic = true
slowCarBody.categoryBitMask = slowCarBitMask
slowCarBody.contactTestBitMask = playerCarBitMask
slowCarBody.mass = 5
slowCarBody.collisionBitMask = playerCarBitMask
slowCar.physicsBody = slowCarBody
gameNode.addChild(slowCar)
}
func didBeginContact(contact: SKPhysicsContact!) {
println("*******************PhysicsContact********************")
}

Answer 1

'didBeginContact' has been changed to 'didBegin' in swift 3
func didBegin(_ contact: SKPhysicsContact) {
//stuff
}
I had a code from swift 2 and 'didBeginContact' was sitting there but wasn't being called. After quite a white I figured out that the function was changed. So, I thought my answer could help someone.

Answer 2

If you want make a contact between car and slowCar you have to init the categoryBitMask of both physicsBodies (I think you did). See the code below to get contact between two physicsBodies. When there is a contact it returns your display function :
//init your categoryBitMask :
let carCategory:UInt32 = 0x1 << 0
let SlowCarCategory:UInt32 = 0x1 << 1
//init car
car.physicsBody?.categoryBitMask = carCategory
car.physicsBody?.contactTestBitMask = slowCarCategory
//init slowCar
slowCar.physicsBody?.categoryBitMask = slowCarCategory
slowCar.physicsBody?.contactTestBitMask = CarCategory
// set your 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 & carCategory) != 0 && (secondBody.categoryBitMask & slowCarCategory) != 0)
{
displayfunction(firstBody.node as SKSpriteNode, car: secondBody.node as SKSpriteNode)
}
}
func displayFunction (slowCar : SKSpriteNode, car : SKSpriteNode)

Answer 3

It turned out to be a simple problem. In my original code I was setting parameters for the SKPhysicsBody detection frame like so:
let carBody = SKPhysicsBody(
rectangleOfSize: car.frame.size, center: car.position)
Similarly I was doing the same for the second node that I was testing physics collisions for.
Simply removing the 'centre:' parameters like so:
let carBody = SKPhysicsBody(rectangleOfSize: car.frame.size)
for the two sprite nodes solved the problem and the nodes now crash into each other and push themselves aside as expected.

Answer 4

Please Note that contact will not be detected between two static bodies
(node.physicsBody?.isDynamic = false)