直接復(fù)制可用：

    //TODO: 分割線頂頭
    //實(shí)現(xiàn)方法
    override func viewDidLayoutSubviews() {
        self.tb!.separatorInset = UIEdgeInsets.zero
        self.tb!.layoutMargins = UIEdgeInsets.zero
    }
    //回調(diào) cell回調(diào) 滾動屏幕cell將要顯示的時候調(diào)用
    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt     indexPath: IndexPath) {
        cell.separatorInset = UIEdgeInsets.zero
        cell.layoutMargins = UIEdgeInsets.zero
    }