问删除单元格Swift Xcode前的警报控制器

EN

override func tableView(_ tableView: UITableView,
               trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?
{
    let modifyAction = UIContextualAction(style: .normal, title:  "Delete", handler: { (ac:UIContextualAction, view:UIView, success:(Bool) -> Void) in
        print("Update action ...")
        success(true)

         let alertView = UIAlertController(title: "", message: "Are you sure you want to delete the item ? ", preferredStyle: .alert)
         let okAction = UIAlertAction(title: "OK", style: .default, handler: { (alert) in
             self.namesArray.remove(at: indexPath.row)
             self.imagesArray.remove(at: indexPath.row)     
             self.tableView.deleteRows(at: [indexPath], with: .fade)
        })
        let cancelAction = UIAlertAction(title: "Cancel", style:.cancel, handler: { (alert) in
             print("Cancel")
        })
        alertView.addAction(okAction)
        alertView.addAction(cancelAction)
        self.present(alertView, animated: true, completion: nil)

    })
    modifyAction.image = UIImage(named: "delete")
    modifyAction.backgroundColor = .purple 
    return UISwipeActionsConfiguration(actions: [modifyAction])

}