UIWebView获取SPA（单页应用程序）网站的当前URL

Question

浏览SPA（单页应用程序）网站时，我想获取UIWebView的当前位置。
^{（是的，我有意使用UIWebView而不是WKWebView 。）}

我知道有多种获取当前URL的方法，例如：

webView.request?.url?.absoluteString
webView.request?.mainDocumentURL?.absoluteString
webView.stringByEvaluatingJavaScript(from: "window.location")

但是，对于SPA网站，对于上述每种方法，即使我导航到该SPA网站上的另一个页面，我也会获得初始网址。

我能做什么？

Answer 1

步骤1：创建自定义URLProtocol来捕获数据请求

class CustomURLProtocol: URLProtocol, URLSessionDataDelegate, URLSessionTaskDelegate {

    // If this returns false, the first request will basically stops at where it begins.
    override class func canInit(with request: URLRequest) -> Bool {
        return true
    }

    override class func canonicalRequest(for request: URLRequest) -> URLRequest {
        return request
    }

    override func startLoading() {

        print(self.request.url) // URL of Data requests made by UIWebView before loading.  
        URLSession(configuration: URLSessionConfiguration.default, delegate: self, delegateQueue: nil).dataTask(with: self.request).resume()
    }

    override func stopLoading() {

    }

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive response: URLResponse, completionHandler: @escaping (URLSession.ResponseDisposition) -> Void) {

        // Data request responses received.  
        self.client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: .allowed)
        completionHandler(.allow)
    }

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {

        // Data request data received.
        self.client?.urlProtocol(self, didLoad: data)
        self.urlSession(session, task: dataTask, didCompleteWithError: nil)
    }

    func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {

        if let error = error {

            self.client?.urlProtocol(self, didFailWithError: error)
            return
        }

        print(self.request.url) // URL of Data requests completed.
        self.client?.urlProtocolDidFinishLoading(self)
    }
}

步骤2：注册您的自定义URLProtocol

在将SPA加载到UIWebview之前，请注册自定义URLProtocol。

URLProtocol.registerClass(CustomURLProtocol.self)

希望这可以帮助！ 抱歉耽搁了，上班了。