将三原色转化为十六进制

定义宏

#define kUIColorFromRGB(rgbValue) [UIColor \

colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \
green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \

blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

调用方法

self.view.backgroundColor = kUIColorFromRGB(0xDCE8F4);