在Swift的MailJet电子邮件中附加PDF

import MessageUI

func sendEmailWithPDF() {
   if MFMailComposeViewController.canSendMail() {
      let mailComposer = MFMailComposeViewController()
      mailComposer.mailComposeDelegate = self
      
      let pdfData = NSData(contentsOfFile: "path_to_pdf_file.pdf")
      mailComposer.addAttachmentData(pdfData!, mimeType: "application/pdf", fileName: "attachment.pdf")
      
      mailComposer.setSubject("Email with PDF attachment")
      mailComposer.setMessageBody("Please find the attached PDF file.", isHTML: false)
      
      present(mailComposer, animated: true, completion: nil)
   }
}

extension ViewController: MFMailComposeViewControllerDelegate {
   func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
      controller.dismiss(animated: true, completion: nil)
   }
}