SYSTEM_VERSION

CONSTS.h

//iOS7 

#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)

#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)

#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

#define RESIZEWITHIOS7(content)  if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7")) {\
content.top += 20;\
}

#define RESIZEWITHIOS7_HEIGHT(content)  if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7")) {\
content.top += 20;\
content.height -= 20;\
}