How to retrieve NSCollectionViewItems from a NSCollectionView

I just implemented an NSCollectionView just like the one described on the developer page and it work perfectly.

Now, how can I access to collectionViewItems from CollectionView?

If you really need to enumerate all items in a collection view, then:

NSUInteger numberOfItems = [[collectionView content] count];
for (NSUInteger itemIndex = 0; itemIndex < numberOfItems; itemIndex++) {
    NSCollectionViewItem *item = [collectionView itemAtIndex:itemIndex];
    // do something with item
}

should do the trick on Mac OS X v10.6+.