gistfile1.m

#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]

gistfile2.m

// From TTTColorFormatter
- (UIColor *)colorFromHexadecimalString:(NSString *)string {
    NSScanner *scanner = [NSScanner scannerWithString:string];
    scanner.charactersToBeSkipped = [[NSCharacterSet alphanumericCharacterSet] invertedSet];

    unsigned value;
    [scanner scanHexInt:&value];

    CGFloat r = ((value & 0xFF0000) >> 16) / 255.0f;
    CGFloat g = ((value & 0xFF00) >> 8) / 255.0f;
    CGFloat b = ((value & 0xFF)) / 255.0f;

    return [UIColor colorWithRed:r green:g blue:b alpha:1.0];
}