swift - 即使点击事件后，如何从 URL 加载部分 HTML？

Question

我编写了一些代码来从 url 加载所有 html 并解析它以删除 header 。所以我在 header 下显示了 html 的其余部分。但是，单击正文 html 中的事件后，屏幕会显示 URL 中的完整 html。

有什么解决办法吗？或者我在处理这个问题时犯了一个错误吗？

我编写的代码如下

import UIKit
import Fuzi

class ViewController: UIViewController {

    @IBOutlet weak var webView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let myURLString = "http://yahoo.com"
        var myHTMLString = ""
        guard let myURL = URL(string: myURLString) else {
            print("Error: \(myURLString) doesn't seem to be a valid URL")
            return
        }

        do {
            myHTMLString = try String(contentsOf: myURL, encoding: .utf8)
        } catch let error {
            print("Error: \(error)")
        }

        do {
            // if encoding is omitted, it defaults to NSUTF8StringEncoding
            let doc = try! HTMLDocument(string: myHTMLString, encoding: String.Encoding.utf8)

            let fullHtml:String = (doc.firstChild(xpath: "//*")?.rawXML)!


            if let header = doc.firstChild(xpath: "//body/div/header") {

                let headerString:String = header.rawXML

                let withoutHeader = fullHtml.replacingOccurrences(of: headerString, with: "")

                webView.loadHTMLString(withoutHeader as String, baseURL: nil)
            }
        } catch let error{
            print(error)
        }

    }

Answer 1

试试这个，它适用于 UIWebViewNavigationType.linkClicked。您可以修改它以与其他 UIWebViewNavigationType 一起使用。

import UIKit
import Fuzi

class ViewController: UIViewController, UIWebViewDelegate {

@IBOutlet weak var webView: UIWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    webView.delegate = self

    let myURLString = "http://yahoo.com"
    var myHTMLString = ""
    guard let myURL = URL(string: myURLString) else {
        print("Error: \(myURLString) doesn't seem to be a valid URL")
        return
    }

    do {
        myHTMLString = try String(contentsOf: myURL, encoding: .utf8)
    } catch let error {
        print("Error: \(error)")
    }

    do {
        // if encoding is omitted, it defaults to NSUTF8StringEncoding
        let doc = try! HTMLDocument(string: myHTMLString, encoding: String.Encoding.utf8)

        let fullHtml:String = (doc.firstChild(xpath: "//*")?.rawXML)!


        if let header = doc.firstChild(xpath: "//body/div/header") {

            let headerString:String = header.rawXML

            let withoutHeader = fullHtml.replacingOccurrences(of: headerString, with: "")

            webView.loadHTMLString(withoutHeader as String, baseURL: nil)
        }
    } catch let error{
        print(error)
    }
}

func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
    if navigationType == .linkClicked
    {
        let myURLString = webView.request?.url.absoluteString
        webView.stopLoading()
        var myHTMLString = ""
        let myURL = URL(string: myURLString)
    do {
        myHTMLString = try String(contentsOf: myURL, encoding: .utf8)
    } catch let error {
        print("Error: \(error)")
    }

    do {
        // if encoding is omitted, it defaults to NSUTF8StringEncoding
        let doc = try! HTMLDocument(string: myHTMLString, encoding: String.Encoding.utf8)

        let fullHtml:String = (doc.firstChild(xpath: "//*")?.rawXML)!


        if let header = doc.firstChild(xpath: "//body/div/header") {

            let headerString:String = header.rawXML

            let withoutHeader = fullHtml.replacingOccurrences(of: headerString, with: "")

            webView.loadHTMLString(withoutHeader as String, baseURL: nil)
        }
    } catch let error{
        print(error)
    }
    }
    return true
}