UIWebView get current URL of SPA (single page application) website

问题

I want to get my UIWebView's current location when browsing an SPA (single-page-application) website.
^{(Yes, I am intentionally working with UIWebView instead of WKWebView.)}

I know that there are multiple approaches to getting the current URL, such as:

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

However, for an SPA website, for each of the approaches above, I am getting the initial url, even when I navigate to another page on that SPA website.

What can I do?

回答1:

Step 1: Creating a custom URLProtocol to catch data requests

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)
    }
}

Step 2: Registering your custom URLProtocol

URLProtocol.registerClass(CustomURLProtocol.self)

Hope this helps! Sorry for the delay, was caught up at work.

来源：https://stackoverflow.com/questions/53864836/uiwebview-get-current-url-of-spa-single-page-application-website

标签

ios

swift

url

uiwebview

single-page-application