iOS RGB宏定义

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

2.https://www.jianshu.com/p/79e4dd8a44bc （一句代码轻松实现十六进制颜色（#开头）转RGB颜色）