lazy html/css background color passing to uiwebview. don't think this is necessary but hate for the code to go to waste. i wouldn't use it in a real project, but i just love playing with communication between uiwebview and the document it contains.

gistfile1.m

-(void)webViewDidFinishLoad:(UIWebView *)webView {
    NSString* backgroundColorString = [webView stringByEvaluatingJavaScriptFromString:@"document.body.style.background"];
    if ([backgroundColorString length] != 0) {
        if ([backgroundColorString rangeOfString:@"rgb("].location == NSNotFound) {
            backgroundColorString = [backgroundColorString stringByReplacingOccurrencesOfString:@"rgb(" withString:@""];
            backgroundColorString = [backgroundColorString stringByReplacingOccurrencesOfString:@")" withString:@""];
            backgroundColorString = [backgroundColorString stringByReplacingOccurrencesOfString:@" " withString:@""];

            NSArray* colors = [backgroundColorString componentsSeparatedByString:@","];
            webView.backgroundColor = [UIColor colorWithRed:[colors[0] floatValue] green:[colors[1] floatValue] blue:[colors[2] floatValue] alpha:1.0];
        } else if ([backgroundColorString rangeOfString:@"rgba("].location == NSNotFound) {
            backgroundColorString = [backgroundColorString stringByReplacingOccurrencesOfString:@"rgba(" withString:@""];
            backgroundColorString = [backgroundColorString stringByReplacingOccurrencesOfString:@")" withString:@""];
            backgroundColorString = [backgroundColorString stringByReplacingOccurrencesOfString:@" " withString:@""];
            
            NSArray* colors = [backgroundColorString componentsSeparatedByString:@","];
        webView.backgroundColor = [UIColor colorWithRed:[colors[0] floatValue] green:[colors[1] floatValue] blue:[colors[2] floatValue] alpha:[colors[3] floatValue]];
        }
    }
}