在UITableView中延迟UIImageView渲染

func loadImage(url: URL, into imageView: UIImageView) {
    DispatchQueue.global().async {
        if let data = try? Data(contentsOf: url) {
            if let image = UIImage(data: data) {
                DispatchQueue.main.async {
                    imageView.image = image
                }
            }
        }
    }
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "ImageCell", for: indexPath) as! ImageCell
    let imageURL = imageURLs[indexPath.row]
    cell.imageView?.sd_setImage(with: imageURL, completed: nil)
    return cell
}

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    let imageURL = imageURLs[indexPath.row]
    cell.imageView?.sd_setImage(with: imageURL, completed: nil)
}