For years, managing data in UICollectionView (and UITableView) was a manual and often error-prone process. We'd update our underlying data model, then call reloadData() or meticulously calculate insertItems(at:), deleteItems(at:), and reloadItems(at:) to animate changes. This often led to out-of-sync data, crashes due to incorrect index paths, and UI glitches. If you've ever battled NSInternalInconsistencyException or Invalid update: invalid number of sections, you know the pain.
Enter UICollectionViewDiffableDataSource (and…
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