How to detect and handle HTTP error codes in UIWebView?

Question

I want to inform user when HTTP error 404 etc is received. How can I detect that? I\'ve already tried to implement

- (void)webView:(UIWebView *)webView didFailL         


        

Answer 1

I am new to iOS and Swift development, and needed to find a way to accomplish this as well, using WKWebView (not UI). I was fortunate enough to run across this site that gave me the following answer, which works perfectly for my needs. It might help passers-by that are looking for the same answer I was.

Using this function (from WKNavigationDelegate):

func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void)

You can create custom responses based on the HTTP response, like so:

func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse, decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {

    // get the statuscode
    guard let statusCode = (navigationResponse.response as? HTTPURLResponse)?.statusCode
    else {
        decisionHandler(.allow)
        return
    }

    // respond or pass-through however you like
    switch statusCode {
    case 400..<500:
        webView.loadHTMLString("
You shall not pass!
", baseURL: nil)
    case 500..<600:
        webView.loadHTMLString("
Sorry, our fault.
", baseURL: nil)
    default:
        print("all might be well")
    }

    decisionHandler(.allow)
}