childViewControllerForStatusBarHidden For Hiding

Question

I am trying to hide half of my status bar. Specifically, I am using REFrostedViewController for my side drawer, and when it comes out, I would like it to go over the status such as in this picture (the app is Google's Inbox).

The current hierarchy of UIViewController as like so:

- REFrostedViewController
 |--MenuViewController
 |--NavigationControler
    |--ContentViewController

I have UIViewControllerBasedStatusBarAppearance set to YES. In my drawer menu (MenuViewController) I have the method

- (BOOL)prefersStatusBarHidden
{
    return YES;
}

In my Navigation Controller I have:

- (UIViewController *)childViewControllerForStatusBarHidden {
    return self.frostedViewController.menuViewController;
}

This hides the status bar in all screens. When I do

- (UIViewController *)childViewControllerForStatusBarHidden {
    if (self.isDrawerOpen) 
    {
        return self.frostedViewController.menuViewController;
    } else {
        return self.frostedViewController.contentViewController;
    }
}

It crashes. self.frostedViewController.contentViewController holds a navigationController (which also has the prefersStatusBarHidden method implemented)