ios - Game restarts after segue to gameOverViewcontroller -

i have problem sprite kit game, restart after use model segue gameoverviewcontroller.
fps gets divide 2 after each time restart game.
need way delete game after use segue.
have tried self.dismissviewcontrolleranimated(true, completion: nil) don't know should put.

i have in storyboard 3 view controllers 1 start uses button modal segue second 1 have game scene played.

override func viewwilllayoutsubviews() {     super.viewwilllayoutsubviews()     print("start vc")      // configure view.     let skview = self.view as! skview     skview.showsfps = true     skview.showsnodecount = true     skview.multipletouchenabled = true      /* sprite kit applies additional optimizations improve rendering performance */     skview.ignoressiblingorder = true      /* set scale mode scale fit window */     scene = gamescene(size: skview.bounds.size)     scene.scalemode = .aspectfill     scene.viewcontroller = self      skview.presentscene(scene) } 

at end when player dies use in game scene.swift

self.viewcontroller?.performseguewithidentifier("gameover", sender: self.viewcontroller!) 

and in gameviewcontroller.swift

override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {     if segue.identifier == "gameover" {         let destviewcontroller: gameoverviewcontroller = segue.destinationviewcontroller as! gameoverviewcontroller         destviewcontroller.score = scene.score         destviewcontroller.screenshot = scene.image         print("segue")         scene.viewcontroller = nil     } } 

to go third view controller.

now have put multiple print command throwout code.
, saw game automatically restarts after segue completed. has body idee how solve problem or knows how maybe should use dismiss function.

thanks in regards

viewwilllayoutsubviews of current view controller called when changing view controller.

so in case protect view scene won't created twice (thus, game restart) :

 override func viewwilllayoutsubviews() {     super.viewwilllayoutsubviews()     print("start vc")      // configure view.     let skview = self.view as! skview     if skview.scene == nil { // check makes sure won't create scene twice        skview.showsfps = true        skview.showsnodecount = true        skview.multipletouchenabled = true         /* sprite kit applies additional optimizations improve rendering performance */        skview.ignoressiblingorder = true         /* set scale mode scale fit window */        scene = gamescene(size: skview.bounds.size)        scene.scalemode = .aspectfill        scene.viewcontroller = self         skview.presentscene(scene)      } }