UINavigationBar background image – iOS 5.0
Update for iOS 5.0: Setting a background image for an UINavigationBar. How to use the new UIAppearance protocol to customize your UI interface elements.
iTunes Connect says: invalid binary
Quick fix for invalid Code Signing Entitlements or invalid binary message from iTunes Connect related to iCloud functionality
iPhone Development – UINavigationBar Background Image
UINavigationBar background image – updated for iOS 5