iphone - How to subclass UINavigationBar for a UINavigationController programmatically?

Question

I'm using a custom drawRect function to draw on UINavigationBar across my application in iOS4, it doesn't use images, only CoreGraphics.

Since you can't implement drawRect in UINavigationBar category in iOS5, Apple is suggesting to subclass UINavigationBar.

How is it possible to replace the UINavigationBar with my subclass in UINavigationController (so it'll be compatible with iOS4 and iOS5) when the navigationBar property is read only?

@property(nonatomic, readonly) UINavigationBar *navigationBar

I'm not using XIBs in my application at all, so adding a UINavigationBar to a NIB and changing the class via InterfaceBuilder is not an option.

Answer 1

In iOS 6 they added a new method to UINavigationController that is retractively available in iOS 5 as well:

- (id)initWithNavigationBarClass:(Class)navigationBarClass
                    toolbarClass:(Class)toolbarClass;

Now you can just pass your custom class when the navigation controller is instantiated.