SwiftUI Edit Item Data Using CoreData

General Discussion
2

I figured it out. It was all in how I was trying to pass the data. Had to setup a new @ObservedObject in the EditItemView and use that name in the DetailView. Updated view codes below. Now the data is passed to the EditItemView.

DetailView:

import CoreData
import SwiftUI

struct DetailView: View {
    @Environment(\.managedObjectContext) var moc
    @ObservedObject var myItem: Item
    
    @State private var showingEditScreen = false
    
    var body: some View {
        NavigationView {
            VStack {
                Text(self.myItem.name ?? "Unknown name")
                Text(self.myItem.attribute ?? "Unknown attribute")
            }
        }
        .navigationBarTitle(Text(myItem.name ?? "Unknown Item"), displayMode: .inline)
        .navigationBarItems(trailing:
            Button(action: {
                self.showingEditScreen.toggle()
            }) {
                Text("Edit")
            }
        )
        .sheet(isPresented: $showingEditScreen) {
            EditItemView(editItem: self.myItem).environment(\.managedObjectContext, self.moc)
        }
    }
}

struct DetailView_Previews: PreviewProvider {
    static let moc = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)

    static var previews: some View {
        let item = Item(context: moc)
        item.name = "Test item"
        item.attribute = "Test attribute"

        return NavigationView {
            DetailView(myItem: item)
        }
    }
}

EditItemView:

import SwiftUI

struct EditItemView: View {
    @Environment(\.managedObjectContext) var moc
    @ObservedObject var editItem: Item
    
    var body: some View {
       Text(self.editItem.name ?? "Unknown name")
    }
}

struct EditItemView_Previews: PreviewProvider {
    static let moc = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
    
    static var previews: some View {
        let item = Item(context: moc)
        item.name = "Test item"
        
        return NavigationView {
            EditItemView(editItem: item)
        }

    }
}