objective c - SCNScene - Not rendering changes to SKNode made on touchesBegan handler -

i'm subclassing sknode , implemening touchbegan handler.

when user clicks on node, node position changed node not move on screen.

i guess need force rendering of skscene somehow.

to test did following minor changes template games of xcode6. here changes template:

gameviewcontroler.swift

 let hud = skscene(filenamed: "hud.sks")   scnview.overlayskscene = hud   var customnode = customnode()  customnode.text = "touch here"  customnode.position = cgpointmake(200, 200);  hud.addchild(customnode) 

new class customenode.swift

import foundation import spritekit  public class customnode:sklabelnode{  public override init() {     super.init();     userinteractionenabled = true; }  public required init(coder adecoder: nscoder) {     fatalerror("init(coder:) has not been implemented") }  public override func touchesbegan(touches: nsset, withevent event: uievent) {     position.y = (position.y + 100) % 300 + 100; //does not update on screen }   

}

if add action ship works:

let ship = scene.rootnode.childnodewithname("ship", recursively: true)!     ship.runaction(scnaction.repeatactionforever(scnaction.rotatebyx(0, y: 2, z: 0, duration: 1))) 

how force rendering?

update clarify complete code of gameviewcontroler.swift, removing everthing not needed.

import uikit import quartzcore import scenekit import spritekit  class gameviewcontroller: uiviewcontroller {      override func viewdidload() {         super.viewdidload()          // create new scene         let scene = scnscene(named: "art.scnassets/ship.dae") //comes xcode6 game project template.          // create , add camera scene         let cameranode = scnnode()         cameranode.camera = scncamera()         scene?.rootnode.addchildnode(cameranode)          // place camera         cameranode.position = scnvector3(x: 0, y: 0, z: 15)           // retrieve scnview         let scnview = self.view scnview          // set scene view         scnview.scene = scene          // allows user manipulate camera         scnview.allowscameracontrol = true          // configure view         scnview.backgroundcolor = uicolor.blackcolor()          let hud = skscene(size: self.view.bounds.size)         scnview.overlayskscene = hud         scnview.overlayskscene.userinteractionenabled = true;          var customnode = customnode()         customnode.text = "touch here"         customnode.position = cgpointmake(200, 200);         hud.addchild(customnode)          //let ship = scene.rootnode.childnodewithname("ship", recursively: true)!         //ship.runaction(scnaction.repeatactionforever(scnaction.rotatebyx(0, y: 2, z: 0, duration: 1)))     } } 

simple add @ viewdidload bottom:

scnview.play(nil)