// 端末の向きがかわったらNotificationを呼ぶ設定.-> viewDidLoadに記載
        NotificationCenter.default.addObserver(self, selector: #selector(GameViewController.onOrientationChange), name: UIDevice.orientationDidChangeNotification, object: nil)
// 端末の向きがかわったら呼び出される.
@objc func onOrientationChange(_ notification: Notification){
        //print(“onOrientationChange/pass”)
        let deviceOrientation: UIDeviceOrientation!  = UIDevice.current.orientation
         // 向きの判定.
         if deviceOrientation.isLandscape {
                  // code
         } else if deviceOrientation.isPortrait {
                 // code
         } else {
                // code
         }
}