SwiftUIActorSync.swift

import SwiftUI

final actor Worker: ObservableObject {
    @MainActor @Published private(set) var lastWorkDoneAt: Date?
    private var counter = 0
    func doWork() {
        self.counter += 1
        DispatchQueue.main.async {
            self.lastWorkDoneAt = .now
        }
    }
    func fetchWorkCounter() -> Int {
        return counter
    }
}

struct MyTestView: View {
    @StateObject private var worker = Worker()

    @State private var queuedWorkCount: Int = 0
    @State private var fetchedWorkCount: Int = 0
    
    var body: some View {
        let _ = Self._printChanges()
        VStack {
            Text("Queued Work Count: \(queuedWorkCount)")
            Text("Fetched Work Count: \(fetchedWorkCount)")
            Divider()
            Button {
                Task {
                    for i in 1...100 {
                        queuedWorkCount += 1
                        await worker.doWork()
                    }
                }
            } label: {
                Text("Enqueue 100 Work")
            }
        }
        .onReceive(worker.lastWorkDoneAt.publisher, perform: { _ in
            Task {
                fetchedWorkCount = await worker.fetchWorkCounter()
            }
        })
//        .task(id: worker.lastWorkDoneAt) {
//            fetchedWorkCount = await worker.fetchWorkCounter()
//        }

    }
}