I need to add buttons to a `UIScrollView` so that it appears on all screens when you scroll. However a `UIScrollView` is just a view and not a controller therefore i cant add components to it. What is the best method to approach this? I can add the buttons on the subviews which are viewcontroller views however thats a little too much work and i was thinking maybe not the best option. How can i simply add one button the the `UIScrollView` view and use it universally for all its views?