Whenever I changed the @State variables to @Published and moved them out of ContentView into a new ContentView-ViewModel file, I get the error I mentioned in the title for this post.

Before I moved the properties out of ContentView, and they were @State properties, my code all compiled without any issues. However, when I moved these into a new file called "ContentView-ViewModel.swift" and made them @Published variables, and also initialized a new variable viewModel = ViewModel() and added viewModel. in the appropriate locations, I receive this error in my ContentView struct. Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs)

I wasn't able to solve the issue with ChatGPT, looking through the forums or Stackoverflow, so any help would be greatly appreciated.

Here is my code:

//
//  ContentView.swift
//  BucketList
//
//  Created by user239371 on 6/6/23.
//

import SwiftUI
import MapKit

struct ContentView: View {
    @StateObject private var viewModel = ViewModel()

    var body: some View {
        ZStack {
            Map(coordinateRegion: viewModel.$mapRegion, annotationItems: viewModel.locations) { location in
                MapAnnotation(coordinate: location.coordinate) {
                    VStack {
                        Image(systemName: "star.circle")
                            .resizable()
                            .foregroundColor(.red)
                            .frame(width: 44, height: 44)
                            .background(.white)
                            .clipShape(Circle())

                        Text(location.name)
                            .fixedSize()
                    }
                    .onTapGesture {
                        viewModel.selectedPlace = location
                    }
                }
            }
            .ignoresSafeArea()

            Circle()
                .fill(.blue)
                .opacity(0.3)
                .frame(width:32, height: 32)

            VStack {
                Spacer()
                HStack {
                    Spacer()
                    Button {
                        let newLocation = Location(id: UUID(), name: "New Location", description: "", latitude: viewModel.mapRegion.center.latitude, longitude: viewModel.mapRegion.center.longitude)
                        viewModel.locations.append(newLocation)
                    } label: {
                        Image(systemName: "plus")
                    }
                    .padding(20)
                    .background(.black.opacity(0.75))
                    .foregroundColor(.white)
                    .clipShape(Circle())
                    .padding(.trailing)
                }
            }
        }
        .sheet(item: viewModel.$selectedPlace) { place in
            Text(place.name)
            EditView(location: place) { newLocation in
                if let index = viewModel.locations.firstIndex(of: place) {
                    viewModel.locations[index] = newLocation
                }
            }
        }
    }

    struct ContentView_Previews: PreviewProvider {
        static var previews: some View {
            ContentView()
        }
    }
}

import Foundation
import MapKit

extension ContentView {
    @MainActor class ViewModel: ObservableObject {
        @Published var mapRegion = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 50, longitude: 0), span: MKCoordinateSpan(latitudeDelta: 25, longitudeDelta: 25))
        @Published var locations = [Location]()
        @Published var selectedPlace: Location?
    }
}

Change

viewModel.$mapRegion

viewModel.$selectedPlace

to

$viewModel.mapRegion

$viewModel.selectedPlace

I think that should do it. Can't say for certain because I wasn't getting the same error, but those two things are definitely incorrect.

To troubleshoot this issue, you can try the following steps:

• Make sure that the new file "ContentView-ViewModel.swift" is added to the appropriate target in your Xcode project.
• Verify that the Location struct is properly defined and accessible from both the ContentView and ViewModel classes.
• Ensure that you have imported the necessary frameworks (SwiftUI and MapKit) in both files.
• Clean and rebuild your project to clear any potential build artifacts or cached errors.
• If the issue persists, consider checking the Xcode console for more specific error messages or warnings that might help identify the root cause.

If none of these steps resolve the issue, it might be helpful to seek assistance from the Swift

Regards carzillauae-com/lamborghini-transmission-repair/