/Swift/Swift uicollectionviewcell how to know when off screen

Swift uicollectionviewcell how to know when off screen

func collectionView(_ collectionView: UICollectionView,
                 didEndDisplaying cell: UICollectionViewCell,
                   forItemAt indexPath: IndexPath) {
    if let cell = collectionView.cellForItem(at: indexPath) {
      // Do something
    }
  }

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