NSCollectionViewItem never instantiate

Question

I\'m a bit lost here: I created a button acting like a colorPicker: clicking on it shows a collectionView in a popover. I first did it with a nib fil containing a view + the

Answer 1

With the collectionView.makeItem(withIdentifier:for:) method, you'll first need to either register the class or the nib file with the collection view:

Using a class

Use register(_:forItemWithIdentifier:) (the first parameter accepts AnyClass?)

collectionView.register(MyCustomCollectionViewItemSubclass.self, forItemWithIdentifier: "SomeId")

Using a Nib file

Use register(_:forItemWithIdentifier:) (the first parameter accepts NSNib?).

let nib = NSNib(nibNamed: "MyCollectionViewItem", bundle: nil)!
collectionView.register(nib, forItemWithIdentifier: "SomeId")

The key thing: On your Nib file, you also have to make sure that you have an NSCollectionViewItem added to the scene. You also have to set the object's class to your subclass in order for it to work (you can set it on the inspector's panel).

Hope this helps!