title: White space in place of a hidden tab bar
body: <p>I use <code>UINavigationController</code> inside <code>UITabBarController</code> and one of the screens in my navigationcontroller is a <code>UIImageView</code>. When I want to show that image full screen I have to hide the navigation bar and tab bar. I'm able to hide the navigation bar correctly but when I hide the tab bar, it leaves 50px of white space. Any suggestion?</p>