NSKeyedArchiver NSKeyedUnarchiver - Auto encode/decode

//NSCodingKeys.h
#import <Foundation/Foundation.h>
@protocol NSCodingKeys <NSObject>
- (NSArray *) archiveKeys;
@end

//NSKeyedArchiver+Additions.h
#import <Foundation/Foundation.h>
#import "NSCodingKeys.h"
@interface NSKeyedArchiver (Additions)
- (void) encodeEntireObject:(NSObject <NSCodingKeys> *) instance;
@end

//NSKeyedArchiver+Additions.m
#import "NSKeyedArchiver+Additions.h"
@implementation NSKeyedArchiver (Additions)
- (void) encodeEntireObject:(NSObject <NSCodingKeys> *) instance; {
    NSArray * keys = [instance archiveKeys];
    for(NSString * key in keys) {
        id val = [instance valueForKey:key];
        [self encodeObject:val forKey:key];
    }
}
@end

//NSKeyedUnarchiver+Additions.h
#import <Foundation/Foundation.h>
#import "NSCodingKeys.h"
@interface NSKeyedUnarchiver (Additions)
- (void) decodeEntireObject:(NSObject <NSCodingKeys> *) instance;
@end

//NSKeyedUnarchiver+Additions.m
#import "NSKeyedUnarchiver+Additions.h"
@implementation NSKeyedUnarchiver (Additions)
- (void) decodeEntireObject:(NSObject <NSCodingKeys> *) instance; {
    NSArray * keys = [instance archiveKeys];
    for(NSString * key in keys) {
        [instance setValue:[self decodeObjectForKey:key] forKey:key];
    }
}
@end


//ModelBase.h
#import <Foundation/Foundation.h>
#import "NSCodingKeys.h"
#import "NSKeyedArchiver+Additions.h"
#import "NSKeyedUnarchiver+Additions.h"

@interface SCModelBase : NSObject <NSCoding,NSCodingKeys>
@end

//ModelBase.m
#import "SCModelBase.h"
@implementation SCModelBase
- (id) initWithCoder:(NSCoder *)aDecoder {
    self = [super init];
    NSKeyedUnarchiver * un = (NSKeyedUnarchiver *)aDecoder;
    [un decodeEntireObject:self];
    return self;
}
- (void) encodeWithCoder:(NSCoder *)aCoder {
    NSKeyedArchiver * ar = (NSKeyedArchiver *)aCoder;
    [ar encodeEntireObject:self];
}
- (NSArray *) archiveKeys {
    return @[];
}
- (void) setNilValueForKey:(NSString *)key {
}
- (void) setValue:(id)value forUndefinedKey:(NSString *)key {
}
@end