将16进制颜色值转换为UIColor

1. 定义一个转换颜色的宏。

#define UIColorFromRGBA(rgbValue, alphaValue) \

[UIColor \

  colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \

         green:((float)((rgbValue & 0x00FF00) >> 8))/255.0 \

          blue:((float)(rgbValue & 0x0000FF))/255.0 \

         alpha:alphaValue]

2. 随时随地使用

UICorlor *color = UIColorFromRGBA(0xFF0000, .75);