ios - Using separate functions on different collision categories -

i'm designing game (ios swift, sprite kit) 3 skphysics-categories:

1. player
2. objects
3. platforms

when collision between either 1 of these categories occurs, follow function runs:

func didbegincontact(contact: skphysicscontact) {     println("collision")     self.gameover = true  } 

this fine when player , object collide, shouldn't run when player walks on platform.

how can set specific functions collisions between categories? or, rephrase question, how can specify different collisions inside of above-mentioned function?

thanks, guys!

you should take contact parameter , use properties. bodya , bodyb allow differentiate between bodies have had collision occur. put these in if statement follows,

    if((bodya.physicsbody == hero.physicsbody) && (bodyb.physicsbody == platform.physicsbody)){     //perform relevant code     }     else if((bodya.physicsbody == hero.physicsbody) && (bodyb.physicsbody == heartpickup.physicsbody)){ //perform relevant code } 

this allow run different sections of code depending on sprites/physics bodies have been connecting.