gistfile1.m

  UIWebView *webView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];
  
  webView.delegate         = self;
  webView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin;
  
  NSURL *htmlPath = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"about" ofType:@"html"]isDirectory:NO];

  dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
  dispatch_async(queue, ^{
    
    NSURLRequest *request = [NSURLRequest requestWithURL:htmlPath];
    
    [webView loadRequest:request];
    
    dispatch_sync(dispatch_get_main_queue(), ^{

      [self.view addSubview:webView];
      
      [webView release];
    });
  });