如何创建具有边距、圆角和阴影的UITableView？

// 设置圆角
cell.layer.cornerRadius = 10
cell.layer.masksToBounds = true

// 添加阴影
cell.layer.shadowColor = UIColor.black.cgColor
cell.layer.shadowOffset = CGSize(width: 0, height: 2)
cell.layer.shadowOpacity = 0.4
cell.layer.shadowRadius = 4

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomTableViewCell
    // 设置单元格的内容
    cell.textLabel?.text = "Cell \(indexPath.row)"
    return cell
}

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    let margin: CGFloat = 10
    let maskLayer = CALayer()
    maskLayer.frame = CGRect(x: margin, y: 0, width: cell.frame.width - 2 * margin, height: cell.frame.height)
    cell.layer.mask = maskLayer
}