IDFA iOS14 返回被拒绝而不显示身份验证弹出窗口

Question

我正在研究在 iOS 14 上获取 IDFA。我使用的是 iPhone 8 Plus。
我已经添加了

<key>NSUserTrackingUsageDescription</key>
<string>App would like to access IDFA for tracking purpose</string>

在 .plist文件。
然后添加

let type = ATTrackingManager.trackingAuthorizationStatus;

返回 .denied , 有

func requestPermission() {
        ATTrackingManager.requestTrackingAuthorization { status in
            switch status {
            case .authorized:
                // Tracking authorization dialog was shown
                // and we are authorized
                print("Authorized")
            
                // Now that we are authorized we can get the IDFA
            print(ASIdentifierManager.shared().advertisingIdentifier)
            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")
            }
        }
    }

但我收到 .denied没有任何弹出窗口。
你知道发生了什么吗？

Answer 1

在系统的设置应用程序中有一个选项“ 允许应用程序请求跟踪”，如果它关闭，requestTrackingAuthorization将返回 .denied立即地。