Swift UI: send text message - swiftui

Question

I modified this code for MFMailComposeViewController to work with MFMessageComposeViewController. For the most part, it works. However, I am having a problem closing the messaging interface. The problem I am having is that when I tap cancel on the messaging interface nothing happens.
import SwiftUI
import UIKit
import MessageUI
struct MessengerView: UIViewControllerRepresentable{
#Binding var isShowing: Bool
#Binding var result: Result<MessageComposeResult, Error>?
class Coordinator: NSObject, MFMessageComposeViewControllerDelegate {
#Binding var isShowing: Bool
#Binding var result: Result<MessageComposeResult, Error>?
init(isShowing: Binding<Bool>,
result: Binding<Result<MessageComposeResult, Error>?>) {
_isShowing = isShowing
_result = result
}
func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
defer {
isShowing = false
}
self.result = .success(result)
controller.dismiss(animated: true, completion: nil)
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(isShowing: $isShowing, result: $result)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<MessengerView>) -> MFMessageComposeViewController {
let vc = MFMessageComposeViewController()
vc.recipients = ["4085551212"]
vc.body = "Hello from California!"
return vc
}
func updateUIViewController(_ uiViewController: MFMessageComposeViewController,
context: UIViewControllerRepresentableContext<MessengerView>) {
}
}
In Usage:
var body: some View {
NavigationView{
if viewModel.signedIn {
VStack {
if MFMessageComposeViewController.canSendText() {
Button("Show messenger view") {
self.isShowingMailView.toggle()
}
} else {
Text("Can't send messages from this device")
}
if result != nil {
Text("Result: \(String(describing: result))")
.lineLimit(nil)
}
}
.sheet(isPresented: $isShowingMailView) {
MessengerView(isShowing: self.$isShowingMailView, result: self.$result)
}
code I modified
Is there something wrong with my messageComposeViewController