sprite kit - SKPhysicsJointFixed in SpriteKit and Swift -

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i'm making game in sprite kit , swift , have sprite @ bottom of screen , falling sprites top want catch , stick sprite @ bottom, i'm trying use skphysicsjointfixed when objects collide instead of falling object sticking 1 @ bottom supposed catch , have attached, seems if bottom sprite adapts physics of falling sprite , falls off screen it. here's code have in didbegincontact method. , skewer name of sprite @ bottom should @ bottom , not disappear.

    if contact.bodya.node!.name == "skewer"     {         let boundx = skewer.physicsbody?.node?.position.x         let fixedjoint = skphysicsjointfixed.jointwithbodya(contact.bodya.node!.physicsbody, bodyb: contact.bodyb.node!.physicsbody, anchor: cgpoint(x: boundx!, y: boundy))         physicsworld.addjoint(fixedjoint)          //            contact.bodyb.node!.removefromparent()     }     else     {         contact.bodya!.node!.removefromparent()     }

and physics bottom screen sprite here

func makeskewer()  {     skewer.name = "skewer"      skewer.position = cgpoint(x: size.width * 0.5, y: size.height * 0.244)      skewer.physicsbody = skphysicsbody(rectangleofsize: skewer.size)     skewer.physicsbody?.affectedbygravity = false     skewer.physicsbody?.categorybitmask = kskewercategory     skewer.physicsbody?.contacttestbitmask = kfoodcategory     skewer.physicsbody?.collisionbitmask = ksceneedgecategory      addchild(skewer) }

and physics falling sprites here

func random() ->cgfloat {     return cgfloat(float(arc4random()) / 0xffffffff) }  func random(#min: cgfloat,max: cgfloat) -> cgfloat {     return random() * (max - min) + min }  func addfood() {     let randomcatchindex = int(arc4random_uniform(uint32(foods.count)))     let food = skspritenode(imagenamed: foods[randomcatchindex])     let actualx = random(min: food.size.width/2, max: size.width - food.size.width/2)     let actualduration = random(min: cgfloat(1.5), max: cgfloat(8.0))     let actionmove = skaction.moveto(cgpoint(x: actualx, y: -food.size.height/2), duration: nstimeinterval(actualduration))     let actionmovedone = skaction.removefromparent()       food.physicsbody = skphysicsbody(rectangleofsize: food.size)     food.position = cgpoint(x: actualx, y: size.height + food.size.height/2)      food.physicsbody?.categorybitmask = kfoodcategory     food.physicsbody?.contacttestbitmask = kskewercategory     food.physicsbody?.collisionbitmask = 0x0     food.physicsbody?.dynamic = true     food.runaction(skaction.sequence([actionmove, actionmovedone]))      addchild(food)  }

set skewer not have dynamic physics. have not being affected gravity, , locks onto food (which traveling down , has momentum), skewer moves it.

in creation of skewer, run following line:

skewer.physicsbody?.dynamic = false

you can ignore affectedbygravity affects dynamic objects.


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