delete.swift

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            let appDelegate = UIApplication.shared.delegate as! AppDelegate
            let context = appDelegate.persistentContainer.viewContext
            let code = codes[indexPath.row]
            context.delete(code)
            codes.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .fade)
            do {
                try context.save()
            }catch {
                print(error)
            }
        }
    }
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }