十六位颜色代码转换成RGB，进行宏定义

#define ColorRGB(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]

#define ColorFromRGB(rgbValue) ColorRGB(rgbValue, 1.0)

self.view.backgroundColor =ColorFromRGB(0x2294ff);