On iOS 7, pushing a controller with a toolbar leaves a gap of unusable space if it’s ultimately contained within a tab bar controller

I found that adding the following 2 lines of code in viewDidLoad of SecondViewController (where you want to hide TabBar but show the tool bar) fixes the problem.

self.extendedLayoutIncludesOpaqueBars = YES;
self.edgesForExtendedLayout = UIRectEdgeBottom;

My viewDidLoad of SecondViewController is as follows:

- (void)viewDidLoad {
    [super viewDidLoad];
    // These 2 lines made the difference
    self.extendedLayoutIncludesOpaqueBars = YES;
    self.edgesForExtendedLayout = UIRectEdgeBottom;

    // The usual configuration
    self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
    self.navigationController.navigationBar.translucent = NO;

    self.navigationController.toolbarHidden = NO;
    self.navigationController.toolbar.barStyle = UIBarStyleBlack;
    self.navigationController.toolbar.translucent = NO;
    .
    .
}

But you need to fix the frame of the view manually as this causes the size to be (320×504). Which means it extends even behind the tool bar. If this is not a concern for you then this solution should work.