Problems using CoreData with List and detail views -- weird animations

I want to have simple app that has a sorted list of items. Clicking on each item goes into a detail view, where clicking another button updates a field of an item, which should redraw the original list.

The list view is given by:

import SwiftUI
import CoreData

struct ContentView: View {
    @Environment(\.managedObjectContext) var context 
    @State private var itemName: String = ""
    // get all data, sorted by date
        entity: Item.entity(),
        sortDescriptors: [NSSortDescriptor(keyPath: \Item.lastEdited, ascending: true)]
    ) var allItems: FetchedResults<Item>
    var body: some View {
        NavigationView {
            List {
                ForEach (allItems) { recipe in
                    NavigationLink(destination: DetailView(item: item).environment(\.managedObjectContext, self.context)) {
                        Text( ?? "No name given")
                    } // nav link


and the detail view is given by:

import SwiftUI
import CoreData

struct DetailView: View {

    @Environment(\.managedObjectContext) var context
    var item: FetchedResults<Item>.Element
    var body: some View {

        Button (action: {
            self.updateDate(item: self.item)
            }) {
                Text("Press me!")
    } // body
    func updateDate(item: Item) {
        item.lastEdited = Date()
    } // func

} // DetailView

Pressing the “Press Me” button on the detail view causes the update to work, and the list view to update, but this happens when I press the button:

  1. A new screen with the detail view is shown
  2. It goes back to the list view

Why does (1) happen? How do I avoid this?

I have Item defined as an Entity in my xcdatamodeld

@srinivasgs Do you still have issues with this?

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