Open Radar

 
Summary:
In cases where we have a UINavigationController within a UITabBarController, if the view controller pushed on the navigation controller has `hidesBottomBarWhenPushed` set (causing the tab bar to disappear) but sets toolbarHidden to NO on the UINavigationController, `bottomLayoutGuide` will return incorrect result -- the length will include the height of both the tab bar AND the toolbar.

screenshot of a view controller that has 93 as the bottom layout guide despite there only being a toolbar in the bottom:
https://www.dropbox.com/s/zlgxo71ut91k17x/Screenshot%202013-10-09%2002.03.09.png

Steps to Reproduce:
1. Create a UITabBarController containing UINavigationController as one of the tabs
2. Push a view controller onto the UINavigationController, with hidesBottomBarWhenPushed set to YES
3. Sets toolbarItems on the view controller and call setToolbarHidden:NO on the navigation controller

Expected Results:
bottomLayoutGuide should only include the height of the toolbar

Actual Results:
The UI looks correct (tab bar is hidden and toolbar is flushed against the bottom), but bottomLayoutGuide returns a length that includes the tab bar height.

Version:
iOS 7.0 (11A465)