gistfile1.m

//UIColor+Defined.h
typedef uint32_t DColor;
+ (UIColor *)colorWithDefinedColor:(DColor)dColor;
+ (UIColor *)colorWithDefinedColor:(DColor)dColor alpha:(CGFloat)alpha;

//UIColor+Defined.m
+ (UIColor *)colorWithDefinedColor:(DColor)dColor {
    return [self colorWithDefinedColor:dColor alpha:1.0f];
}

+ (UIColor *)colorWithDefinedColor:(DColor)dColor alpha:(CGFloat)alpha {
    CGFloat blue = (dColor & 0xff) / 255.0f;
    CGFloat green = (dColor >> 8 & 0xff) / 255.0f;
    CGFloat red = (dColor >> 16 & 0xff) / 255.0f;
    return [self colorWithRed:red green:green blue:blue alpha:alpha];
}

//Constants.h
#import "UIColor+Defined.h"
extern DColor const myColor;

//Constants.m
DColor const myColor = 0xcccccc;