iOS 15 : How to display ATT dialog when the app starts in SwiftUI

Question

在 iOS 14 中，当应用程序在 SwiftUI 中启动时，它可以显示 ATT(应用程序跟踪透明度)对话框，如下所示。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    if #available(iOS 14, *) {
        ATTrackingManager.requestTrackingAuthorization(completionHandler: { status in
            // loadAd()
        })
    } else {
        // loadAd()
    }
    return true
}

但是，在 iOS 15.0 中，它不起作用。 Apple 文档描述如下。

Calls to the API only prompt when the application state is: UIApplicationStateActive. Calls to the API through an app extension do not prompt.https://developer.apple.com/documentation/apptrackingtransparency/attrackingmanager/3547037-requesttrackingauthorization

当应用程序在 iOS 15 中启动时如何显示 ATT 对话框？
2021/9/28 更新
我是这样解决的。

struct HomeView: View {
    var body: some View {
        VStack {
            Text("Hello!")
        }.onReceive(NotificationCenter.default.publisher(for: UIApplication.didBecomeActiveNotification)) { _ in
            ATTrackingManager.requestTrackingAuthorization(completionHandler: { status in })
        }
    }
}

Answer 1

而不是在 中调用应用跟踪透明度权限didFinishLaunchingWithOptions 调用 applicationDidBecomeActive 它会解决你的问题
在 AppDelegate

func applicationDidBecomeActive(_ application: UIApplication) {
    requestDataPermission()
}

func requestDataPermission() {
    if #available(iOS 14, *) {
        ATTrackingManager.requestTrackingAuthorization(completionHandler: { status in
            switch status {
            case .authorized:
                // Tracking authorization dialog was shown
                // and we are authorized
                print("Authorized")
            case .denied:
                // Tracking authorization dialog was
                // shown and permission is denied
                print("Denied")
            case .notDetermined:
                // Tracking authorization dialog has not been shown
                print("Not Determined")
            case .restricted:
                print("Restricted")
            @unknown default:
                print("Unknown")
            }
        })
    } else {
        //you got permission to track, iOS 14 is not yet installed
    }
}

在 info.plist

<key>NSUserTrackingUsageDescription</key>
<string>Reason for data tracking</string>