Actually, you can still give this a try.
The Leopard-style NSCollectionViewItem was restricted to replicating just the
prototype view so the array controller the prototype view was bound to would
not be replicated. Since SnowLeopard uses a nib for the prototype view, the
entire nib will be replicated each time a new NSCollectionViewItem is
instantiated, hence it can create one array controller per item view.
Using this approach, you can still support Leopard by overriding
-newItemForRepresentedObject: and instantiating the same nib yourself, instead
of using the view replication implementation provided by NSCollectionView.
-Kevin
On Mar 23, 2010, at 9:30 PM, Brian Krisler wrote:
> Since I am testing this in a sample app as a proof-of-concept, I have
> a single nib. Plus I have a requirement to support Leopard, so applying
> Snow Leopard specific code is not an option.
>
> After some further investigation, I thing the issue is with my
> NSArrayController
> object in my nib file. What I would really want is an NSArrayController
> for each view within the CollectionView, however it appears to me that this
> is not what is actually happening. I think that when I bind my
> NSCollectionViewItem
> representedObject.blockItems to my NSArrayController, this does not create
> a unique array controller for each CollectionViewItem.
>
> I think my option is to create my layout by hand and give up on attempting to
> use an NSCollectionView. I was thinking the collection view would save me
> some work. Appears to not be the case.
>
> Thanks for the assistance.
>
> Brian
>
> ----- Original Message -----
> From: "Kevin Perry" <kpe...@apple.com>
> To: "Brian Krisler" <bkris...@cs.brandeis.edu>
> Cc: cocoa-dev@lists.apple.com
> Sent: Tuesday, March 23, 2010 12:07:03 PM GMT -05:00 US/Canada Eastern
> Subject: Re: Attempt to nest an NSCollectionView fails.
>
> I'm not sure this is really a usage case that I'd expect to be well tested,
> since it seems a little out of the ordinary.
>
> Anyway, which approach are you using for your prototype view? Is the view in
> the same nib, or have you factored it out into a separate nib, using the fact
> that NSCollectionViewItem became a subclass of NSViewController in Snow
> Leopard? If you're using the former, then the bindings may very well not be
> transferred correctly to each replicated view. Either switch to the Snow
> Leopard approach (highly recommended -- see the AppKit release notes for more
> details), or you can try overriding -newItemForRepresentedObject: and set up
> the bindings yourself.
>
> -Kevin
>
> On Mar 22, 2010, at 8:31 PM, Brian Krisler wrote:
>
>> Hi,
>>
>> I am trying to nest an NSCollectionView inside an existing collection view
>> and am not having much luck. The example I am building runs without issue,
>> however the nested values do not appear.
>>
>> I currently have two model classes:
>>
>> @interface BlockModel : NSObject {
>> NSString *blockTitle;
>> NSMutableArray *blockItems;
>> }
>> @property (readwrite, retain) NSString *blockTitle;
>> @property (readwrite, retain) NSMutableArray *blockItems;
>> @end
>>
>> and
>>
>> @interface BlockItem : NSObject {
>> NSString *itemName;
>> NSString *itemDescription;
>> }
>> @property (readwrite, retain) NSString *itemName;
>> @property (readwrite, retain) NSString *itemDescription;
>> @end
>>
>> In my delegate, I have an NSMutableArray of blockModels.
>>
>> Then in Interface Builder, I have an NSCollection view with a label and a
>> nested NSCollection view. The label contains the BlockModel.blockTitle
>> (which displays correctly).
>>
>> To get content into the nested view, I have an Array Controller with the
>> Content Array bound to the Collection View Item from the parent and a model
>> Key Path of: representedObject.blockItems
>>
>> My nested collection view has its content bound to my Array Controller
>> arrangedObjects. And my array controller is configured to be an object
>> controller with the keys: itemName and itemDescription. I then have two
>> labels in my nested collection view bound to the nested collection view item
>> representedObject.itemName and representedObject.itemDescription.
>>
>> When I execute my code, I can see a few blocks with the proper titles,
>> however the nest view is completely empty.
>>
>> Is there a step that I am missing?
>>
>> Thanks for any help.
>>
>> Brian
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