gistfile1.txt

#import <Foundation/Foundation.h>
#import "NSObject+PropertySupport.h"

@interface PropertyCoder : NSObject <NSCoding> {

}

@end

--

#import "PropertyCoder.h"

#define PROPERTY_KEY_PREFIX @"PCPropertyKeyPrefix"

@implementation PropertyCoder

#pragma mark NSCoding methods
- (void)encodeWithCoder:(NSCoder *)aCoder {
	for (NSString *propertyKey in [[self class] propertyNames]) {
		id propertyValue = [self valueForKey:propertyKey];
		if ([propertyValue conformsToProtocol:@protocol(NSCoding)]) {
			[aCoder encodeObject:propertyValue forKey:[PROPERTY_KEY_PREFIX stringByAppendingString:propertyKey]];
		}
	}
}
- (id)initWithCoder:(NSCoder *)aDecoder {
	self = [super init];
	for (NSString *propertyKey in [[self class] propertyNames]) {
		[self setValue:[aDecoder decodeObjectForKey:[PROPERTY_KEY_PREFIX stringByAppendingString:propertyKey]] forKey:propertyKey];
	}
	return self;
}

@end