Swift 3 How to display a confirmation screen based on MFMailComposeResult email screen

Question

I\'m building an app that constructs an email and presents it in a MFMailComposeViewController for the user to send. When the user sends or cancels it I want the app to res

Answer 1

You need to make your view controller the MFMailComposeViewController delegate and override the method didFinishWith result and switch MFMailComposeResult value inside the completion handler of the dismiss method :

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
    controller.dismiss(animated: true) { 
        // do whatever you need to do after dismissing the mail window
        switch result {
            case .cancelled: print("cancelled")
            case .saved:     print("saved")
            case .sent:
                let alert = UIAlertController(title: "Mail Composer", message: "Mail was successfully sent", preferredStyle: .alert)
                alert.addAction(UIAlertAction(title: "Done", style: .default, handler: nil))
                self.present(alert, animated: true)
            case .failed:    print("failed")
        }
    }
}

Answer 2

If you want to present an alert before the controller is dismissed? Try this one:

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


    switch result {
    case .cancelled:

        let alertController = UIAlertController.init(title: "Cancelled", message: "Some message", 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: "Some message", 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)

    default:
        break;
    }
}