SBApplication 无通信

Question

我正在尝试使用我的自定义切换应用程序来控制 Spotify。创建工作正常，但每次通信都以 nil 或未定义的值结束。例如这个剪断打印“？？”：

func applicationDidFinishLaunching(_ aNotification: Notification) {
    let player = SBApplication(bundleIdentifier: "com.spotify.client")! as SpotifyApplication

    switch player.playerState {
        case .paused:
            print("paused")
        case .playing:
            print("playing")
        case .stopped:
            print("stopped")
        default:
            print("??")
    }
}

知道我做错了什么吗？

Answer 1

感谢@matt，我找到了解决方案 - Info.plist 丢失了 "Privacy - AppleEvents Sending Usage Description"