Re: NSMutableArray help
Re: NSMutableArray help
- Subject: Re: NSMutableArray help
- From: "Alex Wait" <email@hidden>
- Date: Fri, 27 Jun 2008 17:44:51 -0700
To complete the exercise you need to make your app controller a data source
of the NSTableView.
The function he gives you as a hint is the one that is called when a user
edits the field.
On Fri, Jun 27, 2008 at 5:37 PM, Ken Thomases <email@hidden> wrote:
> On Jun 27, 2008, at 5:46 PM, Nick Zitzmann wrote:
>
> On Jun 27, 2008, at 4:41 PM, Eric Lee wrote:
>>
>> My question is, how do you add an object to a NSMutableArray,
>>>
>>
>> -addObject:. This is in the NSMutableArray documentation...
>>
>
> If the NSMutableArray is the backing storage for a property, then modifying
> it directly using -addObject: will not inform objects observing that
> property using KVO of the change. So, be careful when slinging that advice
> around.
>
>
>> and then have
>>> to array display it?
>>>
>>
>> Arrays usually serve as back-ends for NSTableView views (hint).
>>
>> The book has a hint about a method, -replaceObjectAtIndex:withObject:.
>>> How
>>> do you implement that?
>>>
>>
>>
>> What do you mean? The method is already implemented as part of
>> NSMutableArray.
>>
>
> I'm not familiar with the Hillegass book, so I don't know what this
> particular exercise is about. I can think of a few possibilities:
>
> *) He may be hinting that you modify your to-many property using the
> key-value coding (KVC) indexed accessor
> -replaceObjectIn<Key>AtIndex:withObject:, which you can implement in terms
> of -[NSMutableArray replaceObjectAtIndex:withObject:].
>
> *) He may be hinting that you modify your to-many property by obtaining a
> proxy for it using -mutableArrayValueForKey:, and then modify that using
> -replaceObjectAtIndex:withObject:.
>
> *) If you're not up to KVO and bindings, he may be suggesting that you use
> -replaceObjectAtIndex:withObject: to modify the array, and then invoke
> -reloadData on the NSTableView to tell it that the data has changed.
>
> Cheers,
> Ken
>
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--
If you can't be kind, at least have the decency to be vague.
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