Question

我使用WKWebView登录网站，现在我想解析网站的html。如何在swift中访问网站html？我知道它如何用于UIWebView但不适用于WKWebView。

感谢您的帮助！

Answer 1

如果您等到页面已加载，您可以使用：

webView.evaluateJavaScript("document.documentElement.outerHTML.toString()", 
                           completionHandler: { (html: Any?, error: Error?) in
    print(html)
})

您还可以注入一些返回HTML的JavaScript。

let script = WKUserScript(source: javascriptString, injectionTime: injectionTime, forMainFrameOnly: true)
userContentController.addUserScript(script)
self.webView.configuration.userContentController.addScriptMessageHandler(self, name: "didGetHTML")

…

func userContentController(userContentController: WKUserContentController,
        didReceiveScriptMessage message: WKScriptMessage) {

        if message.name == "didGetHTML" {
            if let html = message.body as? String {
                print(html)
            }
        }
}

你可以注入的javascript看起来像：

webkit.messageHandlers.didGetHTML.postMessage(document.documentElement.outerHTML.toString());

Answer 2

另一个例子

wkWebView.evaluateJavaScript("document.body.innerHTML", completionHandler: { (value: Any!, error: Error!) -> Void in

    if error != nil {
        //Error logic
        return
    }

    //let result = value as? String
    //Main logic
})

get HTML from UIWebView
put HTML into UIWebView
put HTML into WKWebView

Answer 3

我在这里是为了在从 DROPBOX 新 APIS 询问令牌后试图获得有关获得结果的线索。（我在没有他们 SDK 的所有内容的情况下实现他们的流程）希望能帮到人。

现在 Dropbox 使用网页作为登录名，并回调您可以处理令牌的 URL。

import WebKit
import SwiftUI

// some code from:
// https://benoitpasquier.com/create-webview-in-swiftui/
// THX pasquier!

let APP_KEY = "YOUR APP KEY"
let REDIRECT_URI = "<YOUR SITE>.dropbox_auth.php"
let DB_URL = "https://www.dropbox.com/1/oauth2/authorize?client_id=APP_KEY&token_access_type=offline&response_type=code&redirect_uri=REDIRECT_URI"

class MyWKDelegate: NSObject, WKNavigationDelegate{
    
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        print("End loading")
        webView.evaluateJavaScript("document.body.innerHTML", completionHandler: { result, error in
            
            if let html = result as? String {
                    print(html)
                }
            })
    }
}

struct WebView: UIViewRepresentable {
        
    typealias UIViewType = WKWebView

    let webView: WKWebView
    
    func makeUIView(context: Context) -> WKWebView {
        return webView
    }
    
    func updateUIView(_ uiView: WKWebView, context: Context) { }
}


class WebViewModel: ObservableObject {
    let webView: WKWebView
    let url: URL!
    let delegate = MyWKDelegate()
    
    init() {
        webView = WKWebView(frame: .zero)
        webView.navigationDelegate = delegate

        let urlStr = DB_URL.replacingOccurrences(of: "APP_KEY", with: APP_KEY).replacingOccurrences(of: "REDIRECT_URI", with: REDIRECT_URI)
        print(urlStr)
        url = URL(string: urlStr)

        loadUrl()
    }
    
    func loadUrl() {
        webView.load(URLRequest(url: url))
    }
}

从Swift中的WKWebview获取HTML

3 个答案: