Why won't my game pause when an iAd is tapped on in Swift? -

what doing wrong? i'm trying game pause when ad tapped on still working in background. how pause? tried other ways pause scene it's not working me.

    func didloadad(banner: adbannerview) {         adbannerview.hidden = false     }       func bannerviewwillloadad(banner: adbannerview!) {           println("ad load")      }      func bannerviewdidloadad(banner: adbannerview!) {          adbannerview.center = cgpoint(x: adbannerview.center.x, y: view.bounds.size.height - view.bounds.size.height + adbannerview.frame.size.height / 2)          adbannerview.hidden = false         println("displaying ad")      }      func bannerviewactiondidfinish(banner: adbannerview!) {         /* un-pause when ad closed */         if let scene = gamescene.unarchivefromfile("gamescene") as? gamescene {             let skview = self.view skview             skview.paused = false             println("close ad")         }      }      func bannerviewactionshouldbegin(banner: adbannerview!, willleaveapplication willleave: bool) -> bool {        if  let scene = gamescene.unarchivefromfile("gamescene") as? gamescene {             let skview = self.view skview             skview.paused = true             println("leave application ad")         //pause game here         }          return true     }      func bannerview(banner: adbannerview!, didfailtoreceiveadwitherror error: nserror!) {          //move off bounds when add didn't load          adbannerview.center = cgpoint(x: adbannerview.center.x, y: view.bounds.size.height + view.bounds.size.height)         adbannerview.hidden = true         println("ad not available")      } //iad----------------------------------------------------------------------------------------------------- 

i think problem here:

let skview = self.view skview skview.paused = true 

and think should check if skview game view. self.view might ad view @ point.

to fix it, find view, instead of using self.

//at top of class var window:uiwindow?  // inside method/function if let viewcontrollers = window?.rootviewcontroller?.childviewcontrollers {     viewcontroller in viewcontrollers {         if viewcontroller.iskindofclass(myviewcontrollerclass) {             println("found it!!!")             viewcontroller.paused = true             }         }     }