后台的UIWebView会停止播放音乐

Question

这是我的代码，我使用uiwebview加载网页并听音乐，但是当按下主页按钮时，音乐停止。我怎样才能在背景中继续工作。

这是我的代码。

var webView: UIWebView!

override func viewWillAppear(_ animated: Bool) {
    navigationItem.title = "Desdeelcanton.com"
    view.backgroundColor = UIColor.white
}

override func viewDidLoad() {
    super.viewDidLoad()
    super.viewDidLoad()
    webView = UIWebView(frame: UIScreen.main.bounds)
    webView.delegate = self
    view.addSubview(webView)
    if let url = URL(string: "http://desdeelcanton.com") {
        let request = URLRequest(url: url)
        webView.loadRequest(request)

            }
    let notificationCenter = NotificationCenter.default
    notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: Notification.Name.UIApplicationWillResignActive, object: nil)

        }

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
func appMovedToBackground() {
    print("App moved to background!")
}