gistfile1.txt

  NSString *path = [[NSBundle mainBundle] bundlePath];
  NSURL *baseURL = [NSURL fileURLWithPath:path];
  NSString *js = [NSString stringWithFormat:@"var headID = document.getElementsByTagName('head')[0];var cssNode = document.createElement('link');cssNode.type = 'text/css';cssNode.rel = 'stylesheet';cssNode.href = '%@/override.css';cssNode.media = 'screen';headID.appendChild(cssNode);", baseURL];
  [_webView stringByEvaluatingJavaScriptFromString:js];