- (NSString *)createCUID:(NSString *)prefix{

NSString *  result;

CFUUIDRef   uuid;

CFStringRef uuidStr;

uuid = CFUUIDCreate(NULL);

uuidStr = CFUUIDCreateString(NULL, uuid);

result =[NSString stringWithFormat:@"%@-%@", prefix,uuidStr];

CFRelease(uuidStr);

CFRelease(uuid);

return result;

}

希望对你有所帮助！