LBXCompletingNavigationController

UINavigationController subclass with added method providing completion block execution on pushed view controllers.

This class is intended as an example of extending the behavior of a UIKit base class without swizzling rocket launchers.

- (void)pushViewController:(UIViewController *)viewController
              animated:(BOOL)animated
            completion:(void (^)(UINavigationController *navigationController, UIViewController *viewController))completion;