A category that converts UIColor to int32_t for convenient persistence.

UIColor+IntegerValue.h

//
//  UIColor+SingleValue.h
//
//  Created by Daniel Duan on 1/26/14.
//  BSD License
//
#import <UIKit/UIKit.h>

@interface UIColor (SingleValue)
- (UIColor *)initWithInteger: (int32_t)integer;
- (int32_t)integerValue;
@end

UIColor+IntegerValue.m

//
//  UIColor+SingleValue.m
//
//  Created by Daniel Duan on 1/26/14.
//  BSD License
//
// Represent a RGBA color in 32 bit int
// Using data generated / stored this way across platform might cause issue due to endian difference.

#import "UIColor+IntegerValue.h"

@implementation UIColor (IntegerValue)
- (UIColor *)initWithInteger: (int32_t)integer
{
    if (self) {
        self = [self initWithRed:(float)((integer >> 24) & 255) / 255
                           green:(float)((integer >> 16) & 255) / 255
                            blue:(float)((integer >> 8 ) & 255) / 255
                           alpha:(float)( integer        & 255) / 255];
    }
    return self;
}
- (int32_t)integerValue
{
    CGFloat r, g, b, a;
    if (self) {
        [self getRed: &r green: &g blue: &b alpha: &a];

        return (((int)(r * 255)) << 24) ^ (((int)(g * 255)) << 16) ^ (((int)(b * 255)) << 8) ^ (int)(a * 255);
    } else {
        return 0;
    }
}
@end