iOS SDK - GET UDID from different Device System Version

iOS SDK - GET UDID from different Device System Version

#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
- (NSString*)deviceUDID {
    NSString *udidString;
   
    if (SYSTEM_VERSION_LESS_THAN(@"6.0")) {
        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        udidString = [defaults objectForKey:@"udidKey"];
        if (!udidString) {
            CFUUIDRef identifierObject = CFUUIDCreate(kCFAllocatorDefault);
            // Convert the CFUUID to a string
            udidString = (NSString *)CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, identifierObject));
            [defaults setObject:udidString forKey:@"udidKey"];
            [defaults synchronize];
            CFRelease((CFTypeRef) identifierObject);
        }
       
    } else {
        udidString = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
    }
    return udidString;
}


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