Experiments using iOS 14's new AppTrackingTransparency framework

iOS14AdTracking.swift

import SwiftUI
import AdSupport
import AppTrackingTransparency

struct ContentView: View {

    @State private var trackingStatus: String = ""
    @State private var idfa: String = ""

    func updateIdfa() {
        // Keep in mind that this is never valid on a Simulator
        idfa = ASIdentifierManager.shared().advertisingIdentifier.description
    }

    func askUserForTracking() {
        ATTrackingManager.requestTrackingAuthorization { status in
            trackingStatus = trackingStatusDescription(status)
            updateIdfa()
        }
    }

    var body: some View {
        VStack {
            Text(trackingStatus)
            Text(idfa)
            Button("Ask User about it") {
                askUserForTracking()
            }
        }.onAppear {
            trackingStatus = trackingStatusDescription()
            updateIdfa()
        }
    }
}

private func trackingStatusDescription(_ status: ATTrackingManager.AuthorizationStatus = ATTrackingManager.trackingAuthorizationStatus) -> String {
    switch status {
    case .notDetermined:
        return "not determined"
    case .restricted:
        return "restricted"
    case .denied:
        return "denied"
    case .authorized:
        return "authorized"
    @unknown default:
        return "unknown"
    }
}