Why sending message crashes when clicking button for third time?

Question

I set up sending message to phone numbers in my project and works fine. I click the button,iPhone sending message page pops up, if I send a message or click Cancel, it goes back. Now if I click the button for second time, nothing happens, if I click for third time, app crashes. The info in console told me to change Use afterScreenUpdates:NO to Use afterScreenUpdates:YES . So I added controller.view.drawHierarchy(in: view.bounds, afterScreenUpdates: true) in my code, but it didn't work. What needs to change here?

in console:

Cannot snapshot view (<UIKeyboardImpl: 0x101a224f0; frame = (0 0; 320 216); layer = <CALayer: 0x170622880>>) with afterScreenUpdates:NO, because the view is not in a window. Use afterScreenUpdates:YES.

My code:

import UIKit
import MessageUI

class ViewController: UIViewController,  MFMessageComposeViewControllerDelegate {

let messageVC = MFMessageComposeViewController()

var phoneNumber = ""

override func viewDidLoad() {   
    super.viewDidLoad()

     messageVC.messageComposeDelegate = self
 }    

@IBAction func sendMessageTapped(_ sender: AnyObject) {

        let recipient = self.phoneNumber  // I get self.phonenumber from other code, no problem.

        messageVC.body = ""
        messageVC.recipients = [recipient]

    self.present(messageVC, animated: true, completion: nil)

}


func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
  // I added this line to fix, didn't work.   
//  controller.view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)


    switch result.rawValue {

    case 0 :

        print("Sending Message cancelled")

        messageVC.dismiss(animated: true, completion: nil)

    case 1:

        print("Message sent")
        messageVC.dismiss(animated: true, completion: nil)

    case 2:

        print("Sending message failed")
        messageVC.dismiss(animated: true, completion: nil)

    default:
        break
    }
  }


 }

Answer 1

I haven't used the MFMessageComposeViewController personally, but looking at the error I can make a guess that it might not like being presented more than once. Have you tried only creating the MFMessageComposeViewController instance when you are about to show it instead of keeping a reference to it in memory and reusing it?