title: How can I show a view that stays working in all the applications controllers in iOS?
body: <p>I have a scenario where the user presses on a button in FirstViewController to upload an image, when that happens a custom view will show up with a custom activity indicator with the upload progress..
  The problem is that I want this custom view and activity indicator to keep showing up in my application even if the user presented or pushed a new viewcontroller(s).</p>