ios - SpriteKit detecting multiple collision instead of once ( Swift 3) -


there 3 skspritenode in skscene class. 1 of them player , other ones gold , unvisible finish object such when player touch it, game finished. problem when player collide gold, gold budget should increase 50 gold. however, xcode detect multiple collision , gold budget increasing multiple times. 50-60 collision detected instead of 1 collision. researched how solve problem. found should use bool, tried set bool didn't solve problem. there can me how detect 1 collision? here gamescene class codes : 

import spritekit import gameplaykit  class level3: skscene, skphysicscontactdelegate {      let playerfilename = "player"     let starfilename = "50gold"     let goalfilename = "goal"     let playercategory   : uint32 = 0x1 << 1     let goalcategory : uint32 = 0x1 << 2     let starcategory : uint32 = 0x1 << 3      override func didmove(to view: skview) {         super.didmove(to: view)         physicsworld.contactdelegate = self          let goal = childnode(withname: goalfilename) as! skspritenode         let player = childnode(withname: playerfilename) as! skspritenode         let star = childnode(withname: starfilename) as! skspritenode          player.physicsbody!.categorybitmask = playercategory         goal.physicsbody!.categorybitmask = goalcategory          star.physicsbody?.collisionbitmask = 1         player.physicsbody?.collisionbitmask = 1         goal.physicsbody?.collisionbitmask = 1         goal.physicsbody?.isdynamic = true          goal.physicsbody!.contacttestbitmask = playercategory          player.physicsbody?.isdynamic = true         star.physicsbody?.isdynamic = true         player.physicsbody?.contacttestbitmask = starcategory          star.physicsbody?.categorybitmask = starcategory          func didbegin(_ contact: skphysicscontact) {              // 1             var firstbody: skphysicsbody             var secondbody: skphysicsbody             // 2             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 == goalcategory {                  contact.bodyb.node?.removefromparent()              }              if firstbody.categorybitmask == playercategory && secondbody.categorybitmask == starcategory {                  playsceneviewcontroller.instance.gold += 50                 print(playsceneviewcontroller.instance.gold)                  contact.bodyb.node?.removefromparent()              }          }     } }

yep - happens. way handle (you can't sprite-kit not call didbegin multiple times in circumstances) make sure contact code accommodates , handling contract multiple times not cause problem (such adding score multiple times, removing multiple lives, trying access node or physicsbody has been removed etc).

for more detail , possible solutions, see answer : https://stackoverflow.com/a/44384390/1430420


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