I'm supposing you are using Cocoa Touch (iOS), for Cocoa (Mac OS X) it's a bit different.
loadRequest starts an asynchronous client request.
You should assign a delegate to your web view that implements UIWebViewDelegate
protocol and move your code into the webViewDidFinishLoading
method:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *html = [webView stringByEvaluatingJavaScriptFromString: @"document.body.getElementsByClassName('bottomwideborder')[1].innerHTML;"];
NSLog(@"%@", html);
}