收到电子邮件结果后执行 Segue

Question

    When sending an email:


        if MFMailComposeViewController.canSendMail()
            {
                let mail = MFMailComposeViewController()
                mail.mailComposeDelegate = self
                // the set to receipient
                // is always this email
                // since this is the owners email
                mail.setSubject("ORDER CONFIRMATION RODEO'S CATERING")
                mail.setToRecipients(["rodeoscatering2018@gmail.com"])
                mail.setMessageBody( m_information_for_body , isHTML: false)
                self.present(mail, animated: true)
            }


         func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?)
         {
          // In here I am checking if it is sent
         case .sent:
            do
            {
               print("sent")

                controller.dismiss(animated: true, completion: nil)
                // and then doing a performSegue below...
                // performSegue(withIdentifier....)
            }

          }

我知道这不是标识符的问题，所有的转场都在那里。我看到打印消息。但不幸的是，当电子邮件提示出现时，我按发送，然后电子邮件控制器被关闭（这很好）并将我带到我所在的当前屏幕并显示打印消息，但是 performSegue 没有'不会发生。

我基本上希望它返回到发生 .sent 案例的位置然后返回主页

Swift 4.2 及最新 xCode 10.1

Answer 1

归功于 Willijay：

显示他的评论有效的代码示例：这将执行以下操作： - 如果邮件已发送，那么当用户在警报上按 'Ok' 时，我们会显示一个警报，说明它已成功，然后 performSegue() 到主屏幕：

func go_back_home() -> Void
{
    let title   = "Confirmation Order Status"
    let message = "Message was sent. Check email for a copy"

    let alert = UIAlertController(
        title: title,
        message: message,
        preferredStyle: .alert)

    alert.addAction(UIAlertAction(title:"OK", style: .default, handler:
    {
        action in self.performSegue(withIdentifier: "order_info_back_to_home_page", sender: self)

    }))

    self.present(alert, animated: true)
}

那么我们使用go_back_home()函数的方式是这样的：

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?)
         {
          // In here I am checking if it is sent
         case .sent:
            do
            {
               print("sent")

                controller.dismiss(animated: true, completion: go_back_home)
            }

          }

收到电子邮件结果后执行 Segue

PerformSegue after getting an email result

uiviewcontroller

ios

segue

swift