How do I get the last HTTP Status Code from a UIWebView?

Question

I would like to detect when a page load request give to a UIWebView has returned a status code in the 5xx or 4xx range.

I\'ve setup the delegate for the web view a

Answer 1

I struggled very hard on this topic when things are on Swift 3.0 now. I even created a custom URLProtocol and tried to intercept all web requests, just to realize eventually that it was unnecessary. The reason for the confusion for me is because that they moved the didReceiveResponse function:

optional public func connection(_ connection: NSURLConnection, didReceive response: URLResponse)

to NSURLConnectionDataDelegate, which inherits from NSURLConnectionDelegate.

Anyway, Here is the Swift 3.0 version that works:

// You first need to have NSURLConnectionDataDelegate on your UIWebView

// MARK: - get HTTP status code

// setup urlconnectiondelegate
// so that the didReceiveResponse is called
func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
    let conn: NSURLConnection? = NSURLConnection(request: request, delegate: self)
    if conn == nil {
        print("cannot create connection")
    }
    return true;
}

// intercept the actual http status code
func connection(_ connection: NSURLConnection, didReceive response: URLResponse) {
    let httpResponse: HTTPURLResponse = response as! HTTPURLResponse;
    print(httpResponse.statusCode)
}