iOS颜色定义define

#define UIColorRGBA(color,nAlpha) UIColorMakeRGBA(color>>16, (color&0x00ff00)>>8,color&0x0000ff,nAlpha)

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

#define UIColorFromRGB(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]

#define ColorWithRGB(r,g,b) [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1.0]

#define RandomColor [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1]

#define UIColorMakeRGB(nRed, nGreen, nBlue) UIColorMakeRGBA(nRed, nGreen, nBlue, 1.0f)

#define UIColorRGB(color) UIColorMakeRGB(color>>16, (color&0x00ff00)>>8,color&0x0000ff)