title: Overlay not scrolling with UITableView - iOS
body: <p>I have a UITableView class that uses the following methods to call a loading overlay when going to the next screen. The problem is that this loading screen does not scroll with the list... So if you scroll a little bit and click on something, the loading screen doesn't show (because it's at the top). How can I get the loading screen to stay on top of the UITableView at all times?  Please know that each UITableView is contained within a UINavBar, which is contained within a UITabBar. Here is my code:</p>
  
  <pre><code>-(void)createLoadScreen
  {
      CGRect screenRect = [self.view bounds];
      CGRect overlayFrame = CGRectMake(0.0, 0.0, screenRect.size.width, screenRect.size.height);
      overlay = [[UIView alloc] initWithFrame:overlayFrame];
      overlay.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
      CGRect frame = CGRectMake(screenRect.size.width / 2 - 25.0, screenRect.size.height / 2 - 70, 25.0, 25.0);
      loading = [[UIActivityIndicatorView alloc] initWithFrame:frame];
      [loading setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];
      [loading sizeToFit];
      loading.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
                                  UIViewAutoresizingFlexibleRightMargin |
                                  UIViewAutoresizingFlexibleTopMargin |
                                  UIViewAutoresizingFlexibleBottomMargin);
      loading.hidesWhenStopped = YES;
      [overlay addSubview:loading];
  }
  
  -(void)showActivityIndicator
  { 
      [self.view addSubview:overlay];
      [loading startAnimating];
  }
  
  -(void)removeActivityIndicator {
      [loading stopAnimating];
      [overlay removeFromSuperview];
  }
  </code></pre>