Check UIAppearance Availability

Question

I am trying to check for the existence of the UIAppearance class using:

NSClassFromString(@"UIAppearance") 

However, this returns nil from iOS4 and iOS5 - who has any tips on how to get around this?

Answer 1

UIAppearance is not a class, it is a protocol. Therefore, to check if this exists or not, you should use:

 NSProtocolFromString(@"UIAppearance"); 

It returns null in <iOS5, but an object on iOS5.

Answer 2

This may come in handy:

List of classes supporting UIAppearance in iOS 5