Question

I have a webview app tool, which essentially consists of the webview and two buttons on a toolbar. One button to view the source of the page, and another button to view/change the current User Agent.

I have both functions working on iOS 5 (view source, and change User Agent), but I cant seem to grab the User Agent in iOS 4.x.

I’m using the following now:

userAgentViewController.UAText = [self.webView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];

This works in iOS5, but in iOS 4.x, it doesnt return anything. Is there a way to achieve the same functionality in iOS 4.x?

Thank you!

Answer 1

to get the useragent, check the HTTP header in the NSURLRequest of your response.
You can retreive this one in the webViewDidFinishLoad delegate method.

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSLog(@"%@", [[webView request] valueForHTTPHeaderField: @"User-Agent"]);
}

to set it, you have to custom an NSMutableURLRequest and give it to your webView

NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:@"yourwebsite.com"]];
[request setHTTPMethod:@"POST"];
[request setValue:USERAGENT_STRING forHTTPHeaderField: @"User-Agent"];
[webView loadRequest:request];
[request release];

and that’s it !