In my app I have a tab bar. And in some views I as well have a toolbar. So when I come to those views with a toolbar it looks ugly - two bars at the bottom of the view. I th
I too struggled with this for a while. Hiding the tab bar is one step in the right direction, but leaves a black rectangle behind. The trick is to resize the layer that backs the UIViewController's view.
I have written a small demo here with a solution:
https://github.com/tciuro/FullScreenWithTabBar
I hope this helps!