在TableView中每隔第二行添加Native Admob AdUnit

Question

我在第2行之后在TableView中添加AdUnit时遇到问题。我发现有人在另一个question尝试但是我不能在Swift中进行。似乎没有任何东西出现，甚至没有在我的细胞中突破以显示第二细胞上发生了某些事情。非常感谢任何帮助。

var nativeExpressAdView: GADNativeExpressAdView!
let request = GADRequest()

  override func viewDidLoad() {
    super.viewDidLoad()
     nativeExpressAdView.adUnitID = “{adUnitIDNumber}”
     nativeExpressAdView.rootViewController = self
  }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let post = posts[(indexPath as NSIndexPath).row]

    if (0 == (indexPath.row % 2)) {
        if let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? FeedPostCell {

            cell.contentView.addSubview(nativeExpressAdView!)
            nativeExpressAdView.loadRequest(request)

        } else {
            return FeedPostCell()

        }

    } else {

        if let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell") as? FeedPostCell {
            cell.postImg.image = UIImage(named:"placeholderImg")
            cell.delegate = self

            if let img = feedViewController.imageCache.object(forKey: post.imageUrl as NSString) {
            cell.configureCell(post, img: img)
            } else {
            cell.configureCell(post)
            }
            return cell
        } else {

        return FeedPostCell()
        }

    }
    return FeedPostCell()
}