Category on NSCoder to support the objective-c subscript syntax

NSCoder+subscript.h

//
//  NSCoder+subscript.h
//
//  Created by Joel Parsons on 29/07/2012.
//  Copyright (c) 2012  All rights reserved.
//

//This category adds objective-c subscript support to NSCoder for basic object types
//handy for implementing NSCoding.

//without this category:
//[anEncoder encodeObject:object forKey:key];
//object = [aDecoder objectForKey:key];
//with this category:
//anEncoder[key] = object;
//object = aDecoder[key];

#import <Foundation/Foundation.h>

@interface NSCoder (subscript)
- (id)objectForKeyedSubscript:(NSString *)key;
- (void)setObject:(id)object forKeyedSubscript:(NSString *)aKey;

@end

NSCoder+subscript.m

//
//  NSCoder+subscript.m
//
//  Created by Joel Parsons on 29/07/2012.
//  Copyright (c) 2012  All rights reserved.
//

#import "NSCoder+subscript.h"

@implementation NSCoder (subscript)

-(id)objectForKeyedSubscript:(NSString *)key{
    return [self decodeObjectForKey:key];
}

-(void)setObject:(id)object forKeyedSubscript:(NSString *)aKey{
    [self encodeObject:object forKey:aKey];
}

@end