スワイプ時に削除以外にも動作を設定(UITableView)

テーブルビューの行を左スワイプした時に「削除」以外の複数の処理を選択できるようにする
下記は処理として以下を追加したもの。
・「メール」：メール送信　（MFMailComposeViewControllerDelegate追加）
・「エキスポート」：他のアプリにデータを渡す（UIDocumentInteractionControllerDelegate追加）

    var documentInteraction:UIDocumentInteractionController? = nil

   
    // スワイプ時に削除以外にも動作を設定
    func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
        let mailTitle:String = NSLocalizedString("Mail", tableName: "Message", comment: "メール")
        let mail: UITableViewRowAction = UITableViewRowAction(style: .normal, title: mailTitle) { (action, index) -> Void in
            self.exportByMail(indexPath.row)
        }
        mail.backgroundColor = NC_173_KAMENOZOKI
        let exportTitle:String = NSLocalizedString("Export", tableName: "Message", comment: "エキスポート")
        let export: UITableViewRowAction = UITableViewRowAction(style: .normal, title: exportTitle) { (action, index) -> Void in
            self.exportEntry(indexPath.row)
        }
        export.backgroundColor = NC_186_SORA
        
        let deleteTitle:String = NSLocalizedString("Delete", tableName: "Message", comment: "削除")
        let delete: UITableViewRowAction = UITableViewRowAction(style: .normal, title: deleteTitle) { (action, index) -> Void in
            self.removeConfirm(indexPath.row)
        }
        delete.backgroundColor = NC_014_KARAKURENAI
        
        return [export, mail, delete]
    }

    func exportByMail(_ index:Int) {
        if !MFMailComposeViewController.canSendMail() { // メール送信不可
            print("Mail can't be send")
            return
        }
        let csvString:String = appDl.entries[index].texts2CSV()
        let mailVC = MFMailComposeViewController()
        let toRecipients:[String] = [""] //Toのアドレス指定
        
        mailVC.mailComposeDelegate = self
        mailVC.setSubject("Repeat after YOU!: Data export(テキストデータエクスポート)")
        mailVC.setToRecipients(toRecipients)
        let mailMessage = "テキストデータをCSV形式で添付します。\nExport the data with csv format.\n　\n -- Repeat after YOU! --"
        mailVC.setMessageBody(mailMessage, isHTML: false)
        
        mailVC.addAttachmentData(csvString.data(using: String.Encoding.shiftJIS, allowLossyConversion: false)!, mimeType: "text/csv", fileName: "Export_output.csv" )
        self.present(mailVC, animated: true, completion:nil)

    }

    func exportEntry(_ index:Int) {
        let csvString:String = appDl.entries[index].texts2CSV()
        let tempPath = NSTemporaryDirectory() as String
        let filePath = tempPath + "output.csv"
        print(filePath)
        print(csvString)
        let tmpUrl = URL(fileURLWithPath: filePath)
        
        do {
            try csvString.write(to: tmpUrl, atomically: true, encoding: .shiftJIS)
        } catch {
            print("File write error:",filePath)
            return
        }
        
        documentInteraction = UIDocumentInteractionController(url: tmpUrl)
        documentInteraction!.delegate = self
        documentInteraction!.uti = "public.text"
        if !documentInteraction!.presentOpenInMenu(from: self.view.frame, in: self.view, animated: true) {
            print("File send error")
            // 送信できるアプリが見つからなかった時の処理
            let alert = UIAlertController(
                title: NSLocalizedString("Alert!", tableName: "Message",comment: "注意！"),
                message: NSLocalizedString("send-fail-message", tableName: "Message",value: "Failed to send.", comment: "ファイルを送れるアプリが見つかりません"),
                preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }
        
    }

    @objc func documentInteractionController(_ controller: UIDocumentInteractionController, willBeginSendingToApplication application: String?) {
        print("Start file sending to ",application ?? "")
    }

    @objc func documentInteractionController(_ controller: UIDocumentInteractionController,
                                       didEndSendingToApplication application: String?) {
        print("Complete file sending to ",application ?? "")
        
    }