Detect iOS version in runtime

Question

I'm currently writing an app that uses Facebook integration built into iOS 6. Now in order to do that, I need to

#import <Social/Social.h>

How do I ensure that the device can actually run the code and won't crash (check if it's iOS 6 or iOS 5.1 and then performing the right code, because I support iOS 5.1<= )?

Answer 1

You could use:

[[UIDevice currentDevice] systemVersion]

Answer 2

This works fine for me:

if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0")){
//Use social framework
}else{
//other option
}