Modern collection view registration with Storyboards?

Question

pj4533_evertrue OP

Created Nov ’21

Replies 2

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Can you use modern collection view cell/view registration with custom views designed in a storyboard?

I am familiar with putting a custom cell, or reusable view, inside the collection view of the storyboard, and configuring it with constraints and outlets. Then manually dequeueing the cell/view, and configuring the view.

How do you do this with the new decoupled methods of cell registration and configuration?

For example, if I have the following:

        let headerRegistration = UICollectionView.SupplementaryRegistration

        <HeaderReusableView>(elementKind: "header") { (supplementaryView, _, indexPath) in
            supplementaryView.titleLabel?.text = "foo"
        }

        self.datasource?.supplementaryViewProvider = { (_, _, index) in
            return self.collectionView.dequeueConfiguredReusableSupplementary(using: headerRegistration, for: index)
        }

HeaderReusableView is a UICollectionReusableView that is added to my storyboard, and the titleLabel is added, and hooked up via an outlet. When I run the code, it does not seem to make the connection, and the outlet is nil.

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Answer 1

Claude31 OP

Nov ’21

You have :

elementKind: "header"

Where did you define it ?

Did you try replacing with:

elementKind: "Header"

Or simply UICollectionView.elementKindSectionHeader

There was an interesting discussion on the forum a few months ago, if that may help:

https://developer.apple.com/forums/thread/682570

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Answer 2

pj4533_evertrue OP

Nov ’21

Claude31, your answer did put me on the right track. I realized that the real issue is that I don't think storyboards support compositional layouts just yet, and when you put a cell/view in a storyboard, it is somehow tied to the layout. I found that I could get visual design using a nib though, and then this code works:

let headerRegistration = UICollectionView.SupplementaryRegistration<HeaderReusableView>(supplementaryNib: UINib(nibName: "HeaderReusableView", bundle: Bundle(for: HeaderReusableView.classForCoder())), elementKind: "header") { supplementaryView, elementKind, indexPath in

            supplementaryView.titleLabel?.text = self.sections[indexPath.section].rawValue

        }

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