PreferredStatusBarStyle for native controllers

Since apple introduced UIViewControllerBasedStatusBarAppearance

and preferredStatusBarStyle

in iOS 7, I try to understand that it is best to change the status bar color for the built-in type controller, for example:

UIImagePickerController  
MFMailComposeViewController  
UISearchDisplayController  

      

        
        
        
      

    

for example, on use, UISearchDisplayController

I want to change the status bar from light to dark when the search bar appears.
How should I do it? do i need a subclass UISearchDisplayController

? maybe a category?

and as far UIImagePickerController

as it has its own stack of view controllers, how to change the style of the status bar for all of them when the photo picker is presented?

so far i have used the global cause

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];  

      

        
        
        
      

    

but now its approach to per-ViewController, so how can I change controllers that are not mine?