如何在Swift 4的WKWebView中加载网页之前消除白屏？

Question

在我的项目中，我有启动画面和WKWebViewController。启动画面后，在WkWebViewController中重定向并打开一个URL。但是在启动屏幕2-3秒后，出现一个白色屏幕，然后加载网页。我要删除此白色屏幕或更改该屏幕的颜色。我的网页代码是：

class ViewController: UIViewController , WKNavigationDelegate  {

@IBOutlet weak var webview: WKWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    webview.navigationDelegate = self
}

override func viewWillAppear(_ animated: Bool) {
     loveredioweb()
}

func loveredioweb()  {
    let url = "URL"
    let request = URLRequest(url: URL(string: url)!)
    self.webview.load(request)
}

func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
    SVProgressHUD.show()
}

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    SVProgressHUD.dismiss()
}

func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
    SVProgressHUD.dismiss()
  }
}