absimas

physicsBody?.categoryBitMask = Mask.HERO
physicsBody?.collisionBitMask = Mask.OBSTACLE | Mask.ITEM | Mask.SCENE | Mask.GROUND
physicsBody?.contactTestBitMask = Mask.OBSTACLE | Mask.ITEM | Mask.SCENE | Mask.GROUND

absimas

@objc protocol Contactable {
    func didContact()
}

absimas

func didBeginContact(contact: SKPhysicsContact) {
    if let bodyA = contact.bodyA as? Contactable {
        bodyA.didContact()
    }
    if let bodyB = contact.bodyB as? Contactable {
        bodyB.didContact()
    }
}