swift - 在应用程序中关闭电子邮件弹出窗口后显示消息警报

Question

我想在点击发送或取消电子邮件弹出窗口后立即显示一个警报 Controller ，显示我的邮件是否已发送，我已设法在发送消息之前而不是在发送消息之后显示警报 Controller ...:

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {


    switch result {
    case .cancelled:

        let alertController = UIAlertController.init(title: "Cancelled", message: "Send Email has been cancelled", preferredStyle: .alert)
        alertController.addAction(UIAlertAction.init(title: "Ok", style: .default, handler: { (alertAction) in
            controller.dismiss(animated: true, completion: nil)
        }))
        controller.present(alertController, animated: true, completion: nil)

    case .sent:



        let alertController = UIAlertController.init(title: "Sent", message: "Message Sent Successfully", preferredStyle: .alert)
        alertController.addAction(UIAlertAction.init(title: "Ok", style: .default, handler: { (alertAction) in
           controller.dismiss(animated: true, completion: nil)

        }))



    default:
        break;
    }

这是我尝试过的

Answer 1

问题是你尝试使用一个弹出窗口的 Controller ，而且它会被关闭，你可以尝试

 UIApplication.shared.keyWindow?.rootViewController?.present(alertController, animated: true, completion: nil)