Ending a game when two nodes collide - swift

Question

I have two separate nodes with their own physics bodies, and when they collide, an SKScene with the high score and replay button should present itself. This is how my scene is called:
func didBeginContact(contact: SKPhysicsContact) {
gameOver()
print("gameOver")
}
And this is how my physics bodies for my nodes are set up:
func createDown(position: CGPoint) -> SKNode {
let circleNode = SKSpriteNode()
let circle = SKSpriteNode(imageNamed: "first#2x")
circleNode.position = CGPointMake(position.x, position.y)
circleNode.physicsBody = SKPhysicsBody(circleOfRadius: 30)
circleNode.physicsBody?.dynamic = false
circle.size = CGSize(width: 75, height: 75)
circleNode.addChild(circle)
circleNode.name = "circleNode"
circle.name = "CIRCLE"
let up = SKAction.moveByX(0, y: -9000, duration: 100)
physicsBody?.categoryBitMask = blackCategory
circleNode.runAction(up)
return circleNode
}
func playerPhysics() {
player.physicsBody = SKPhysicsBody(circleOfRadius: 30)
player.physicsBody?.affectedByGravity = false
player.physicsBody?.categoryBitMask = playerCategory
player.physicsBody?.contactTestBitMask = blackCategory
}
And here is my gameOver function:
func gameOver() {
gameEnd = true
let reveal = SKTransition.fadeWithDuration(1)
let scene = GameOver(size: self.scene!.size)
view!.presentScene(scene, transition: reveal)
}
Am I missing something? Will post more code if necessary.

Answer 1

Just use intersectsNode and call gameOver() when the two nodes collide.
if yourNode.intersectsNode(yourSecondNode) {
gameOver()
}
SKNode Class Reference: SKNode

Answer 2

You need to add the physics world as a contact delegate for your methods to work.
class GameScene: SKScene, SKPhysicsContactDelegate {
override func didMoveToView(view: SKView) {
physicsWorld.contactDelegate = self
And like Whirlwind said, you need to set your categoryBitMask and contactTestBitMask for the circle node.
Then everything should work. I hope I could help.