#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 ) http://stackoverflow.com/questions/3339722/how-to-check-ios-version