material-components_material-components-ios/components/List/docs/typical-use.md

Typical use

Because List Items ultimately inherit from UICollectionViewCell, clients are not expected to instantiate them themselves. Rather, cell classes are registered with UICollectionViews. Then, in -collectionView:cellForItemAtIndexPath:, the client is expected to cast the cell to a List Item class.

Swift

// registering the cell
collectionView.register(MDCBaseCell.self, forCellWithReuseIdentifier: "baseCellIdentifier")

// casting the cell to the desired type within `-collectionView:cellForItemAtIndexPath:`
guard let cell = collectionView.cellForItem(at: indexPath) as? MDCBaseCell else { fatalError() }

Objective-C

// registering the cell
[self.collectionView registerClass:[MDCBaseCell class]
        forCellWithReuseIdentifier:@"BaseCellIdentifier"];

// casting the cell to the desired type within `-collectionView:cellForItemAtIndexPath:`
MDCBaseCell *cell =
    [collectionView dequeueReusableCellWithReuseIdentifier:@"BaseCellIdentifier"
                                              forIndexPath:indexPath];