How to define preprocessor macro to check iOS version

Question

I use it to check iOS version, but it doesn't work:

#ifndef kCFCoreFoundationVersionNumber_iPhoneOS_5_0
#define kCFCoreFoundationVersionNumber_iPhoneOS_5_0 675.000000
#endif

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_5_0
#define IF_IOS5_OR_GREATER(...) \
if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iPhoneOS_5_0) \
{ \
__VA_ARGS__ \
}
#else
#define IF_IOS5_OR_GREATER 0
#endif

when I make

#if IF_IOS5_OR_GREATER
NSLog(@"iOS5");
#endif

nothing happens. Is something wrong here?

Answer 1

Much simpler:

#define IS_IOS6_AND_UP ([[UIDevice currentDevice].systemVersion floatValue] >= 6.0)

Answer 2

#ifdef __IPHONE_5_0 

etc

Just look for that constant. All the objective c constants start with two underscores