常用的宏

#define RGB(r, g, b)        [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1.0f]

#define RGBA(r, g, b, a)    [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a/255.0f)]

#define RGBFromHexadecimal(value) [UIColor colorWithRed:((float)((value & 0xFF0000) >> 16))/255.0 green:((float)((value & 0xFF00) >> 8))/255.0 blue:((float)(value & 0xFF))/255.0 alpha:1.0]

#define LeoLog(fmt, ...) NSLog((@"******应用名***Leo******: %s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)