gistfile1.swift

import SwiftUI

// AsyncObservableTest.ContentView() in your app struct

struct AsyncObservableTest {
    
    @Observable
    class Content {
        var counter = 0
    }
    
    struct ContentView: View {
        @State var content: Content?
        @State var counterFromStream = 0
        
        var body: some View {
            NavigationStack {
                if let content {
                    Button("Increment \(content.counter)") {
                        content.counter += 1
                    }
                    .buttonStyle(.borderedProminent)
                    Text("Counter from stream: \(counterFromStream, format: .number)")
                    .task {
                        let modelCounterDidChange = AsyncStream {
                            await withCheckedContinuation { continuation in
                                withObservationTracking {
                                    let _ = content.counter
                                } onChange: {
                                    continuation.resume()
                                }
                            }
                            // return content.counter // we couild insert the value in the stream but it makes the loop below more complicated
                        }
                        var iterator = modelCounterDidChange.makeAsyncIterator()
                        repeat {
                            counterFromStream = content.counter
                        } while await iterator.next() != nil
                    }
                }
                else {
                    Text("Initing object...")
                }
            }
            .onAppear {
                content = Content()
            }
        }
    }
}