WKWebView中的URL加载问题

Question

我从API获取URL，正在将该URL传递到Webview并尝试加载，但未加载。我不知道为什么，但是它不起作用。即使没有显示任何错误或崩溃。太奇怪了，但是我不知道我缺少什么，因为所有代码都写得很好。这是我的代码：

self.loadWeb(webURL: newsUrl!)
func loadWeb(webURL: String) {
    let url = URL(string: webURL)
    MBProgressHUD.hide(for: self.view, animated: true)
    webView.navigationDelegate = self
    webView.uiDelegate = self
    webView.load(URLRequest(url: url!))
}
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    webView.frame.size.height = 1
    webView.scrollView.isScrollEnabled = false
    webView.frame.size = webView.scrollView.contentSize
    self.bgViewHeight.constant = webView.frame.size.height
}

private func webView(webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: NSError) {
    print(error.localizedDescription)
}

func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
    print("Start to load")
}
func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!) {
    print("finish to load")
}

我该如何加载？