swift - didBeginContact not called : this instance is unique to me -


so, still experimenting sprite kit first time ever, , test collision. so, searched around bit in apple's documentation, around stack overflow, online tutorials, , other forums. however, unable find tip or code makes doing work. so, here relevant pieces of code:

this code obstacle:

func createobstacle(){      var ball = skshapenode(circleofradius: 20)     var width = uint32(self.frame.width)     var random_number = arc4random_uniform(width)     ball.position = cgpointmake(cgfloat(random_number), frame.height+20)     ball.strokecolor = skcolor.blackcolor()     ball.glowwidth = 1.0     ball.fillcolor = skcolor.darkgraycolor()     ball.physicsbody = skphysicsbody(circleofradius: 20)     ball.physicsbody!.affectedbygravity = true     ball.physicsbody?.categorybitmask = 6     ball.physicsbody?.dynamic = true     self.addchild(ball) }

this relevant code thing collide with:

    let circle = skshapenode(circleofradius: 20)     circle.physicsbody = skphysicsbody(circleofradius: 20)     circle.fillcolor = skcolor.bluecolor()     circle.strokecolor = skcolor.bluecolor()     circle.glowwidth = 1.0     circle.physicsbody?.categorybitmask = 4     circle.physicsbody?.dynamic = true     circle.physicsbody?.affectedbygravity = false

and code contact:

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 == 4 && secondbody.categorybitmask == 6) || (firstbody.categorybitmask == 6 && secondbody.categorybitmask == 4)){          println("hi")     }else{println("no")}  }

sadly, nothing being printed @ all, something's wrong. idea why doesn't work?

your class should have delegate skphysicscontactdelegate.

class gamescene: skscene, skphysicscontactdelegate {

in didmovetoview write this: 

    physicsworld.contactdelegate = self

edit

define categorybitmask this

struct physicscategory {      static let circlecategory   : uint32 = 0b1       // 1     static let ballcategory     : uint32 = 0b10      // 2 }

give categorybitmask circle , ball

circle.physicsbody?.categorybitmask = physicscategory.circlecategory ball.physicsbody?.categorybitmask = physicscategory.ballcategory

then check contact this:

(func didbegincontact(contact: skphysicscontact) {      if ((contact.bodya.categorybitmask == 0b1 && contact.bodyb.categorybitmask == 0b10 ) || ( contact.bodya.categorybitmask == 0b1 && contact.bodyb.categorybitmask == 0b1 ))         println("contact")     } }

sorry typos didnt used editor


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