取消电子邮件时关闭视图

Question

我一直在研究这个应用程序。我无法关闭电子邮件的视图。我该怎么办？

import UIKit
import MessageUI
class ViewController: UIViewController, MFMailComposeViewControllerDelegate {
    @IBOutlet weak var Label: UITextField!
    @IBAction func SendOrder(_ sender: Any) {
        let recipients = ["EmailHere"]
        let title = "My order is:"
        let message = Label.text
        let mc: MFMailComposeViewController = MFMailComposeViewController()
        mc.mailComposeDelegate = self
        mc.setToRecipients(recipients)
        mc.setSubject(title)
        mc.setMessageBody(message!, isHTML: false)
        self.present(mc, animated: true, completion: nil)

我尝试了代表方法，但它提出了：我该怎么办？

https://i.stack.imgur.com/xqgtw.png

Answer 1

尝试此

@IBAction func btnEmail(_ sender: AnyObject) {
       self.openEmail()
 }

func openEmail() {
    if MFMailComposeViewController.canSendMail() {
        let mail = MFMailComposeViewController()
        mail.mailComposeDelegate = self
        mail.setSubject("Your subject Name")
        mail.setMessageBody("Contact Us", isHTML: false)
        mail.setToRecipients(["[e-mail]"])
        present(mail, animated: true, completion: { _ in })
    }
    else {
        print("This device cannot send email")
    }
}

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
    switch result {
    case .sent:
        print("You sent the email.")
        break
    case .saved:
        print("You saved a draft of this email")
        break
    case .cancelled:
        print("You cancelled sending this email.")
        break
    case .failed:
        print("Mail failed:  An error occurred when trying to compose this email")
        break
    }
    dismiss(animated: true, completion: { _ in })
}