Question

我有一个视图，它在viewDidLoad（）方法内，在执行某些操作后会加载一个子视图：

   override func viewDidLoad() {
        super.viewDidLoad()
        //OTHER STUFF...
        let config = WKWebViewConfiguration()
        config.userContentController = contentController
        self.myWebView = WKWebView(
            frame: self.containerView.bounds,
            configuration: config
        )
        self.myWebView.navigationDelegate = self
        self.view.addSubview(self.myWebView)
    }

加载网络视图后，我需要做一些检查。我该怎么做：

webSubviewDidLoad() {
    //do stuff
}

Answer 1

有一个特定的代表didFinishNavigation

didFinishNavigation documentation

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let configuration = WKWebViewConfiguration()
        let webView = WKWebView(frame: .zero, configuration: configuration)
        webView.translatesAutoresizingMaskIntoConstraints = false
        webView.navigationDelegate = self
        view.addSubview(webView)

        /* add layout constraints that make the webview fitting in your view */

        if let url = URL(string: "https://google.com") {
            webView.load(URLRequest(url: url))
        }
    }

}

  extension ViewController: WKNavigationDelegate {

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        print("Finished navigating to url \(webView.url)")
    }

}

或者您可以检查EstimateProgress属性中的进度

estimatedProgress documentation

Answer 2

第1步。添加一个观察者，当您的Web视图加载完成时，如下所示。这段代码应该放在视图控制器类的viewDidLoad方法中。

myWebView.addObserver(self, forKeyPath: #keyPath(WKWebView.isLoading), options: .new, context: nil)

第2步。在视图控制器中实现observeValue（forKeyPath :)方法，执行所需的任何操作，如下所示。

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if keyPath == "isLoading" && !myWebView.isLoading {
        // Do your needed action here
    }
}

Answer 3

实现您自己的WebView：

StringWriter writer = new StringWriter();    

XMLStreamWriter sw =         
XMLOutputFactory.newFactory().createXMLStreamWriter(writer);

StAXResult streamResult = new StAXResult(sw);

System.setProperty("javax.xml.transform.TransformerFactory",
"com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl");

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING,document.getXmlEncoding());
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.VERSION, "1.0");
document.setXmlStandalone(false); 
DOMSource domSource = new DOMSource(document);

transformer.transform(domSource, streamResult );
System.out.println(writer.toString());

如何知道我的WKWebview派生子视图何时在Swift中加载

3 个答案: