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Hacking with MacOs project7 Drag and drop

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Hi , In Hacking with MacOs in the drag and drop part ( page 392 ) I do not understand why the CollectionView needs to be updated in this way: // 6. update the array and collection view photos.insert(destinationURL, at: indexPath.item) ctaollectionView.insertItems(at: [indexPath])

And not simply by doing collectionView.reloadData() I would have thought that is was for performance reasons, but it just does not work and I cannot figure out why. Regards Etienne

   

Hacking with macOS is a complete coding series that teaches macOS ... You learn Swift whilst you're making actual macOS initiatives with AppKit and SwiftUI, so that you can apply ... Meet NSCollectionView for the primary time, then upload drag and drop picture

   

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