how can i change my spritekit on collision in spritekit swift -


how can change spritekit on collision in spritekit swift.

        else if collidedbird.birdtype == 6 {             if uidevice.currentdevice().userinterfaceidiom == .pad             {                 _bird.physicsbody?.applyimpulse(cgvectormake(0, birdimplusereturn(70.0)))             } else {                 _bird.physicsbody?.applyimpulse(cgvectormake(0, birdimplusereturn(70.0)))             }             let fire = nstimer.scheduledtimerwithtimeinterval(0.05, target: self, selector: selector("createdragonfire"), userinfo: nil, repeats: false)             playeffectsound("bs_std_jump_sfx.mp3")             _platform.removefromparent()         }

if want change image of sprite, should use skphysicscontactdelegate method.

in general means have implement skphysicscontactdelegate, make new struct:

for example: 

struct physiccategories {         static let nonec : uint32 = 0x1 << 0         static let bird : uint32 = 0x1 << 1         static let platformc : uint32 = 0x1 << 2         static let finishc : uint32 = 0x1 << 3         static let obstaclec : uint32 = 0x1 << 4     }

then go in didmovetoview() function , write: 

physicsworld.contactdelegate = self

dont forget make step!

then add func 

func didbegincontact(contact: skphysicscontact) {          var contactbody1 = contact.bodya         var contactbody2 = contact.bodyb           if contactbody1.categorybitmask < contactbody2.categorybitmask{              contactbody1 = contact.bodya             contactbody2 = contact.bodyb           } else {              contactbody1 = contact.bodyb             contactbody2 = contact.bodya          }          if ((contactbody1.categorybitmask == physiccategories.birdc) && (contactbody2.categorybitmask == physiccategories.obstaclec)){             // make gameover function that!             // gameover()           }         if ((contactbody1.categorybitmask == physiccategories.birdc) && (contactbody2.categorybitmask == physiccategories.platformc)){              contactbody1.node.texture = sktexture(imagenamed: "")            }

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