Try this New Code:
- (void)createAdBannerView
{
_adBannerView = [[ADBannerView alloc] initWithFrame:CGRectZero];
_adBannerView.delegate = self;
[_adBannerView setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
CGRect frame = _adBannerView.frame;
frame.origin.y = -frame.size.height;
frame.origin.x = 0.0f;
_adBannerView.frame = frame;
AppDelegate * app = (((AppDelegate*) [UIApplication sharedApplication].delegate));
[app.navController.view addSubview:_adBannerView];
}