swift - Why does my code return a bad access exception? -

i've got swift sprite kit project trying work on, whenever run game crashes on gameviewcontroller @ startup exc_bad_access code 1. here code:

class gameviewcontroller: uiviewcontroller {  @iboutlet var imagebanner: uiimageview? @iboutlet var textbanner: uilabel? @iboutlet var playbutton: uibutton? @iboutlet var sharebutton: uibutton? @iboutlet var infobutton: uibutton?  var skview = skview() var scene = skscene()  override func viewdidload() {     super.viewdidload()     print("view did load")     skview = skview(frame: self.view.frame)     print("1")     scene = gamescene(size: skview.bounds.size)     print("2")     skview.showsfps = false     print("3")     skview.showsnodecount = false     skview.ignoressiblingorder = true     scene.scalemode = .aspectfill     print("done") } 

i guess it's worth noting "done" logged in console.

you should not create new skview. , why creating scene variable initialized skscene() never use?

please use code xcode generates gameviewcontroller.

class gameviewcontroller: uiviewcontroller {      override func viewdidload() {         super.viewdidload()          if let scene = gamescene(filenamed:"gamescene") {             // configure view.             let skview = self.view as! skview             skview.showsfps = true             skview.showsnodecount = true              /* sprite kit applies additional optimizations improve rendering performance */             skview.ignoressiblingorder = true              /* set scale mode scale fit window */             scene.scalemode = .aspectfill              skview.presentscene(scene)         }     }    // more stuff here }