Await User Interaction

ContentView.swift

//
//  ContentView.swift
//  Confirmator
//
//  Created by Gerald Burke on 4/26/24.
//

import SwiftUI

struct ContentView: View {
    @StateObject var confirmation = Confirmation()
    var body: some View {
        VStack {
            Button(action: { confirmation.request() }) {
                Text("Let‘s do this")
            }
            .buttonStyle(BorderedButtonStyle())
        }
        .alert(
            "Confirm",
            isPresented: $confirmation.requested,
            actions: {
                Button(action: { confirmation.approved = false }) {
                    Text("Cancel")
                }
                Button(action: { confirmation.approved = true }) {
                    Text("Confirm")
                }
            },
            message: {
                Text("Are you sure you want to do this?")
            }
        )
        .padding()
    }
}

#Preview {
    ContentView()
}

@MainActor class Confirmation: ObservableObject {
    @Published var requested: Bool = false
    @Published var approved: Bool = false

    func request() {
        Task {
            // Confirmation is pending
            approved = false
            // Update UI to prompt user
            requested = true
            // Await the next value which will be supplied by user action
            var iterator = $approved.values.dropFirst().makeAsyncIterator()
            _ = await iterator.next()
            // The user took action
            print(approved ? "Confirmed" : "Cancelled")
        }
    }
}