How to create UINavigationBar drop shadow

Question

Would like to know create drop shadow for UINavigationbar. I tried to create custom navigation bar background with drop shadow, but the drop shadow cover the background view

Answer 1

Since iOS 6.0, UINavigationBar has a property shadowImage:

@property(nonatomic,retain) UIImage *shadowImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;

which of course greatly simplifies this very common task :D