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Re: NSCollectionView and CoreData question




On 23/04/2008, at 12:08 AM, I. Savant wrote:

Having set the 'content' binding to the arrangedObjects key in IB didn't
produce a result though doing it programmatically has. Not sure why this
would be.

It depends. Since you have provided neither the exact bindings settings you're using nor the code you used to establish the binding manually, it's impossible to say.

Further, with the NSView, is there a way of knowing which of the objects
that are contained in the NSCollectionView is being drawn and further being
able to get the data for that specific object?

Not to sound like a broken record, but, have you *read* the documentation? Sure, the NSCollectionView / NSCollectionViewItem mechanism is a bit more challenging than your standard button or table, but not by much and it is fairly well-documented. See NSCollectionViewItem's documentation, paying particular attention to the phrase "represented object".

What I've been using as far as trying to get the represented object is first having the following as part of awakeFromNib in my controller object.


[theView setDelegate:self];
[collectionView bind:@"content"
toObject:self
withKeyPath:@"arrangedObjects"
options:nil];
[collectionView setItemPrototype:collectionViewItem];
repObject = [[NSManagedObject alloc] initWithEntity: [NSEntityDescription entityForName:@"PodcastEpisodeTimestamp"
inManagedObjectContext:[selfmanagedObjectContext]]
insertIntoManagedObjectContext:[self managedObjectContext]];


	[collectionViewItem setRepresentedObject:repObject];


Though when I try to do something with what is returned by the represented object such as


[[collectionViewItem representedObject] valueForKey:@"length"]

This unfortunately returns nil.

Is anyone aware of what I'm doing wrong with this?

Thanks,
Matthew Delves
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