I am trying to learn SwiftData, so I created a very simple app (macOS) to learn the basics. I ran into what turns out to be very odd behavior (at least I am not understanding).

In my code below, everything works as expected – Until I comment out the “if” around my Button in ContentView (Look for my <—– in the code) I get the following problem – I run the app and add 1 ‘Note’ to it. Quit the app, and then go back into it and click on the Note I added before – it comes up as Nil, even though I know it is not (the print stmt prints out the UUID).

Put the “if” stmt back in and rerun – it works as expected.

What is happening when the Button view is always there (no if stmt) ?

import SwiftUI
import SwiftData

@main
struct SwiftDataTryApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .modelContainer(for: Note.self)
    }
}

@Model
class Note: Identifiable {
    var id: String = UUID().uuidString
    var titleText: String = ""
    var bodyText: String = ""
    init() {}
}

struct ContentView: View {
    @Environment(.modelContext) var modelContext
    @Query var notes: [Note]
    @State var showEditNoteView: Bool = false
    @State var selectedNote: Note?
    var body: some View {
        VStack() {
            List {
                ForEach(notes) { note in
                    Text(note.titleText)
                        .onTapGesture {
                            if !showEditNoteView {
                                print(note.id)
                                selectedNote = note
                                showEditNoteView = true
                            }
                        }
                }
            }
            .padding()
            if !showEditNoteView {  //    <------- Without this, I see the problem
                Button("+") {
                    selectedNote = Note()
                    modelContext.insert(selectedNote!)
                    showEditNoteView = true
                }
            }
        }
        .padding()
        .popover(isPresented: $showEditNoteView) {
            if selectedNote != nil { EditNoteView(isPresented: $showEditNoteView, note: selectedNote!) }
            else { Text("selectedNote is nil") .padding() }
        }
    }
}

struct EditNoteView: View {
    @Environment(.modelContext) var modelContext
    @Binding var isPresented: Bool
    @Bindable var note: Note
    @State var titleText: String = ""
    @State var bodyText: String = ""
    var body: some View {
        VStack() {
            TextField("Title", text: $titleText)
            TextEditor(text: $bodyText)
            Button("Save") { isPresented = false }
        }
        .padding()
        .frame(width: 728, height: 512)
        .onAppear {
            titleText = note.titleText
            bodyText = note.bodyText
        }
        .onDisappear {
            note.titleText = titleText
            note.bodyText = bodyText
            do {
                try modelContext.save()
            } catch {
                print(error.localizedDescription)
            }
        }
    }
}