UIStatusBarStyle PreferredStatusBarStyle does not work on iOS 7

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In my iPhone application built with Xcode 5 for iOS 7 I set UIViewControllerBasedStatusBarAppearance=YES in info.plist, and in my ViewController I have this code:

-(void)UIStatusBarStyle PreferredStatusBarStyle ()

        {

            return UIStatusBarStyle.LightContent;

        }

But this code is not called and the status bar is still black against the black background.

I know its possible to change this app-wide by setting UIViewControllerBasedStatusBarAppearance=NO in info.plist, but I actually need to alter this on a viewController by viewController basis.