ViewController.swift

class ViewController: UITableViewController {

  override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
      let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomCell
      cell.onButtonTap = {
          self.navigationController?.pushViewController(NewViewController(), animated: true)
      }
  }
}