Dark shadow on navigation bar during segue transition after upgrading to Xcode 5.1 and iOS 7.1

When I am navigating back & forth between parent and child controllers in a master - detail navigation controller, i see a dark shadow on the right side of navigation bar at top. It started after I upgraded to Xcode 5.1. It feels rough and distracting. How can I get rid of it?

self.navigationController.view.backgroundColor = [UIColor whiteColor];

I solved this problem by setting the background color of the navigation controller's view.

self.navigationController.navigationBar.translucent = NO; 

For Newer Swift Versions:

navigationController?.navigationBar.isTranslucent = false