gistfile1.m

- (void)viewDidLoad
{
  [super viewDidLoad];

  [webView setBackgroundColor:[UIColor clearColor]];
  [self hideGradientBackground:webView];

  [webView loadHTMLString:@"This is a completely transparent UIWebView. Notice the missing gradient at the top and bottom as you scroll up and down." baseURL:nil];
}

- (void) hideGradientBackground:(UIView*)theView
{
  for (UIView * subview in theView.subviews)
  {
    if ([subview isKindOfClass:[UIImageView class]])
      subview.hidden = YES;

    [self hideGradientBackground:subview];
  }
}