title: iOS: Modal ViewController with transparent background
body: <p>I'm trying to present a view controller modally, with a transparent background. My goal is to let both the presenting and presented view controllers's view to be displayed at the same time. The problem is, when the presenting animation finishes, the presenting view controller's view disappears.</p>
  
  <pre><code>- (IBAction)pushModalViewControllerButtonPressed:(id)sender
  {
      ModalViewController *modalVC = [[ModalViewController alloc] init];
      [self presentViewController:modalVC animated:YES completion:nil];
  }
  </code></pre>
  
  <p>I know I could just add the view as a subview, but I'd like to avoid this solution for some reason. How could I fix it?</p>