触发iOS swift的后台邮件

import MessageUI

func sendEmail() {
    if MFMailComposeViewController.canSendMail() {
        let mailComposeViewController = MFMailComposeViewController()
        mailComposeViewController.mailComposeDelegate = self
        mailComposeViewController.setSubject("邮件主题")
        mailComposeViewController.setToRecipients(["recipient@example.com"])
        mailComposeViewController.setCcRecipients(["cc@example.com"])
        mailComposeViewController.setBccRecipients(["bcc@example.com"])
        mailComposeViewController.setMessageBody("邮件正文", isHTML: false)
        
        present(mailComposeViewController, animated: true, completion: nil)
    } else {
        // 无法发送邮件，处理错误情况
    }
}

extension ViewController: MFMailComposeViewControllerDelegate {
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        switch result {
        case .cancelled:
            print("邮件发送取消")
        case .saved:
            print("邮件保存成功")
        case .sent:
            print("邮件发送成功")
        case .failed:
            print("邮件发送失败")
        default:
            break
        }
        
        controller.dismiss(animated: true, completion: nil)
    }
}

sendEmail()