You need to implement the indexed array accessors as defined in the KVC programming guide. Then you must use those accessors to access the array and the KVO triggering will work. You can also call -mutableArrayValueForKey: and use that array to addObject: and such and it will in turn call the accessor methods and the … Read more
Unfortunately, no. The full documentation for what’s allowed using Key-Value Coding is here. There are not, to my knowledge, any operators that allow you to grab a particular array or set object.
But shouldn’t the synthesized accessors automatically return such a proxy object? No. What’s the proper way to work around this–should I write a custom accessor that just invokes [super mutableArrayValueForKey…]? No. Implement the array accessors. When you call these, KVO will post the appropriate notifications automatically. So all you have to do is: [myObject insertObject:newObject … Read more
objectForKey: is an NSDictionary method. An NSDictionary is a collection class similar to an NSArray, except instead of using indexes, it uses keys to differentiate between items. A key is an arbitrary string you provide. No two objects can have the same key (just as no two objects in an NSArray can have the same … Read more