ios - Border collision detection -

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i'm making game sprite kit , have collision detection setup this:

    ball.physicsbody?.categorybitmask = ballcategory     borderbody.physicsbody?.categorybitmask = bordercategory

and handler -didbegincontact():

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 == ballcategory && secondbody.categorybitmask == bordercategory {         print("you lose!")     }  }

i have line set contact delegate:

self.physicsworld.contactdelegate = self

but when run game, collision not detected , nothing happens. wrong?

see documentation here. need set contacttestbitmask if want receive contact/intersection notifications. unlike collisionbitmask default value 0xffffffff, default value contacttestbitmask 0x00000000.


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