CODEWITHSUNDEEP
xcodeswiftsprite-kitcollision-detection
Jeff
Jeff

Reputation: 850

Detecting Collision SpriteKit Swift

Collision detection is not calling the NSLog in the didBeginContact function. The physics are working fine... Can someone show me what I've done wrong? Everything I've tried is giving me the same result. 

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {

let category0: UInt32 = 0x1 << 0
let category1: UInt32 = 0x1 << 1
let category2: UInt32 = 0x1 << 2
let category3: UInt32 = 0x1 << 4
let position1:CGFloat = 100

override func didMoveToView(view: SKView) {

    self.physicsBody = SKPhysicsBody (edgeLoopFromRect:self.frame)
    self.physicsWorld.gravity = CGVectorMake(0, -9)
    physicsWorld.contactDelegate = self

    let ground = SKSpriteNode(color: UIColor .redColor(), size: CGSizeMake(self.size.width, self.size.height/16))
    ground.position = CGPointMake(self.size.width/2, self.size.height - self.size.height + ground.size.height)
    ground.zPosition = position1
    self.addChild(ground)
    ground.physicsBody = SKPhysicsBody(rectangleOfSize: ground.size)
    ground.physicsBody?.categoryBitMask = category2
    ground.physicsBody?.contactTestBitMask = category1
    ground.physicsBody?.collisionBitMask = category1
    ground.physicsBody?.dynamic = false
    ground.physicsBody?.affectedByGravity = false
    ground.name = "Ground"

    let launchingPad = SKSpriteNode(color: UIColor .redColor(), size: CGSizeMake(self.size.width/6, self.size.height/16))
    launchingPad.position = CGPointMake(self.size.width - launchingPad.size.width/2 - 5, self.size.height - self.size.height + launchingPad.size.height * 4)
    launchingPad.zPosition = position1
    self.addChild(launchingPad)
    launchingPad.physicsBody = SKPhysicsBody(rectangleOfSize: launchingPad.size)
    launchingPad.physicsBody?.categoryBitMask = category1
    launchingPad.physicsBody?.contactTestBitMask = category2
    launchingPad.physicsBody?.collisionBitMask = category2
    launchingPad.physicsBody?.dynamic = true
    launchingPad.physicsBody?.affectedByGravity = true
    launchingPad.name = "LaunchingPad"

    func didBeginContact(contact: SKPhysicsContact) { 

        let firstBody = contact.bodyA.node as! SKSpriteNode

        let secondBody = contact.bodyB.node as! SKSpriteNode

        if ((firstBody.name == "LaunchingPad") && (secondBody.name == "Ground")){

NSLog("Contact")

}}}}

Upvotes: 2

Views: 742

Answers (1)

Jeff
Jeff

Reputation: 850

Answering my own question based on KnightOfDragon comments. Here is the working method. 

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 == category1) && (secondBody.categoryBitMask == category2)){
    NSLog("contact")
}
}

Upvotes: 2

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