sprite kit - Basic Swift SpriteKit Collisions using PhysicsBodys -


the problem: seem having little trouble getting player collide coin, , adding +1 coinlabel upon collision. player should continue moving after coming in contact coin.

what have now: code have now, player travels through coin, there no collision takes place , +1 isn't added coin label.

i still learning swift language, appreciate given.

code: 

struct collidertype {  static let playercategory: uint32 = 0x1 << 0  static let boundary: uint32 = 0x1 << 1 ​   ​static let coincategory: uint32 = 0x1 << 2 ​ ​static let bodya: uint32 = 0x1 << 4 ​ ​static let bodyb: uint32 = 0x1 << 8  }  ​override func didmovetoview(view: skview) { ​ var coinint = 0 ​ ​ ​ ​self.physicsworld.gravity = cgvectormake(0.0, -7.0) physicsworld.contactdelegate = self  player = skspritenode(imagenamed: "player") player.zposition = 1 player.position = cgpoint(x: cgrectgetmidx(self.frame), y: cgrectgetmidy(self.frame)) player.physicsbody = skphysicsbody(circleofradius: player.size.width / 5.12) player.physicsbody?.dynamic = true player.physicsbody?.allowsrotation = false  self.addchild(player)  generatecoins()  ​ ​ coin = skspritenode( imagenamed: "coin") coin.physicsbody? = skphysicsbody(circleofradius: coin.size.height / 10) coin.physicsbody?.dynamic = false coin.physicsbody?.allowsrotation = false coin.zposition = 1 ​self.addchild(coin) ​ player.physicsbody?.categorybitmask = collidertype.playercategory ​player.physicsbody?.contacttestbitmask = collidertype.boundary player.physicsbody?.collisionbitmask = collidertype.coincategory | collidertype.boundary  coin.physicsbody?.categorybitmask = collidertype.coincategory coin.physicsbody?.contacttestbitmask = collidertype.playercategory coin.physicsbody?.collisionbitmask = collidertype.playercategory  func didplayercollidewithcoin(player: skspritenode, coin: skspritenode) {    self.coin.removefromparent()  self.coin += 1  coinlabel.text = "\(coinint)"  }  ​ ​     ​ ​func generatecoins()  {  if(self.actionforkey("spawning") != nil){return}  let cointimer = skaction.waitforduration(7, withrange: 2)  let spawncoin = skaction.runblock {  self.coin = skspritenode( imagenamed: "coin")  self.coin.physicsbody = skphysicsbody(circleofradius: self.coin.size.height / 10)  self.coin.name = "coin"  self.coin.physicsbody?.dynamic = false  self.coin.physicsbody?.allowsrotation = false  var coinposition = array<cgpoint>()  coinposition.append((cgpoint(x:340, y:103)))  coinposition.append((cgpoint(x:340, y:148)))  coinposition.append((cgpoint(x:340, y:218)))  coinposition.append((cgpoint(x: 340, y:343)))  let spawnlocation =     coinposition[int(arc4random_uniform(uint32(coinposition.count)))]  let action = skaction.repeatactionforever(skaction.movetox(+self.xscale, duration: 4.4))  self.coin.runaction(action)  self.coin.position = spawnlocation  self.addchild(self.coin)  print(spawnlocation)  }  let sequence = skaction.sequence([cointimer, spawncoin])  self.runaction(skaction.repeatactionforever(sequence), withkey: "spawning")  } ​​ func didbegincontact(contact:skphysicscontact)  {  let bodya: skphysicsbody = contact.bodya  let bodyb: skphysicsbody = contact.bodyb  if ((bodya.categorybitmask == collidertype.playercategory) &&     (bodyb.categorybitmask == collidertype.coincategory)){  didplayercollidewithcoin(bodya.node as! skspritenode, coin: bodyb.node as! skspritenode)  }     ​         ​}

you try leaving contacttestbitmasks same remove collisionbitmasks between player , coin:

player.physicsbody?.categorybitmask = collidertype.playercategory ​player.physicsbody?.contacttestbitmask = collidertype.boundary player.physicsbody?.collisionbitmask = collidertype.boundary   coin.physicsbody?.categorybitmask = collidertype.coincategory coin.physicsbody?.contacttestbitmask = collidertype.playercategory

this way, when player collides coin register, wont "bounce off" , continue moving in same direction.

*note: using may require use 

func didbegincontact(contact: skphysicscontact) {

method instead of

func didplayercollidewithcoin(player: skspritenode, coin: skspritenode) {

but recommend trying didplayercollidewithcoin() method first.

in case need it, implemented this: 

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 == playercategory &&   secondbody.categorybitmask == coincategory { print("your player passes through coin") score = score + 1 } }

for more details see tutorial ray wenderlich: https://www.raywenderlich.com/123393/how-to-create-a-breakout-game-with-sprite-kit-and-swift


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