Proxy that emulates Responsibility Chain pattern

ADVResonsibilityChainProxy.h

//
//  Copyright © 2013 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface ADVResonsibilityChainProxy : NSObject

- (id) initWithHandlers:(NSArray *)hanlders;

@end

ADVResonsibilityChainProxy.m

//
//  Copyright © 2013 Yuri Kotov
//

#import "ADVResonsibilityChainProxy.h"

@implementation ADVResonsibilityChainProxy
{
    NSArray *_handlers;
}

#pragma mark - ADVResonsibilityChainProxy
- (id) initWithHandlers:(NSArray *)hanlders
{
    if ((self = [super init]))
    {
        _handlers = hanlders;
    }
    return self;
}

- (id) childRespondingToSelector:(SEL)selector
{
    for (id handler in _handlers)
    {
        if ([handler respondsToSelector:selector]) return handler;
    }
    return nil;
}

#pragma mark - NSObject 
- (BOOL) respondsToSelector:(SEL)selector
{
    return [super respondsToSelector:selector] || [self childRespondingToSelector:selector];
}

- (id) forwardingTargetForSelector:(SEL)selector
{
    return [self childRespondingToSelector:selector] ?: [super forwardingTargetForSelector:selector];
}

@end