NGAAutoObserver.h #1

//
//  NGAAutoObserver.h
//  P4Menu
//
//  Created by Michael Bishop on 10/3/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <Foundation/Foundation.h>

// Use this to observe one's own properties in clearer code than the standard KVO methods.

// All you need to do is:
// 1 - register/deregister in your init/dealloc methods
// 2 - Create a special method named valueDidChangeFor<KeyPath> and it will be called
//     when that property has changed.
//     If you add a colon to the end of your specially named method, you will get
//     the change dictionary of the change (with new/old values)
//     You can also specify key paths in your valueDidChangeFor<KeyPath> like
//     valueDidChangeForKey_key_key_key:

/*
 
CHANGE
------

-(id)init
{
    ...
    [self addObserver:self forKeyPath:@"info" options:0 context:NULL];
    [self addObserver:self forKeyPath:@"client.name" options:0 context:NULL];
    ...
}
 
-(void)dealloc
{
    ...
    [self removeObserver:self forKeyPath:@"info"];
    [self removeObserver:self forKeyPath:@"client.name"];
    ...
}

 -(void)observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void*)context
{
    if ( [keyPath isEqualToString:@"info"] )
        DO_SOMETHING_WITH_INFO_CHANGE
    if ( [keyPath isEqualToString:@"client.name"] )
        DO_SOMETHING_WITH_CLIENT_CHANGE
}

TO
--
#import "NGAAutoObserver.h"
 
-(id)init
{
    ...
    [self registerAllAutoObservationMethods];
    ...
}

-(void)dealloc
{
    ...
    [self unregisterAllAutoObservationMethods];
    ...
}
 
-(void)valueDidChangeForInfo:(NSDictionary*)change
{
    DO_SOMETHING_WITH_INFO_CHANGE
}

-(void)valueDidChangeForClient_name:(NSDictionary*)change
{
    DO_SOMETHING_WITH_CLIENT_CHANGE
} 

*/
 
 
@interface NSObject (NGAAutoObservation)

-(void)registerObserverMethodsForKeyPaths:(NSArray*)keyPaths;
-(void)deregisterObserverMethodsForKeyPaths:(NSArray*)keyPaths;

-(void)registerAllAutoObservationMethods;
-(void)unregisterAllAutoObservationMethods;

@end