swift - Integration of adMob: Unexpectedly found nil while unwrapping an optional value -


i have switched on iad admob , having hard time integrating banner ads.

when run code, fatal error: unexpectedly found nil while unwrapping optional value

here code:

      import googlemobileads     class gameviewcontroller: uiviewcontroller, gadbannerviewdelegate {  override func viewdidload() {     super.viewdidload()     let scene = gamescene(size: view.bounds.size)     let skview =  view as! skview     skview.showsfps = false     skview.showsnodecount = false     skview.ignoressiblingorder = true     scene.scalemode = .resizefill     skview.presentscene(scene)       print("google mobile ads sdk version: " + gadrequest.sdkversion())     var banner: gadbannerview!    banner.delegate = self    banner.adunitid = " ca-app-pub-xxxxxxxxxxx/xxxxxxxxxx" //crashing on line     banner.loadrequest(gadrequest())     } }

i feel i've followed admob website, im having hard time figuring out error coming from. is/has else had problem?

  1. you haven't initialized banner anywhere, should either create @iboutlet if want create in interface builder, or initialize programmatically. why app crashes.

    var banner: gadbannerview! banner = gadbannerview(frame: self.view.frame) // initialized, fullscreen frame

  2. the adunitid shouldn't start space.


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