ios 随机色 宏定义

#define RGBColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1]

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

#define RandColor RGBColor(arc4random_uniform(255), arc4random_uniform(255), arc4random_uniform(255))

#define NoteCenter [NSNotificationCenter defaultCenter]