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CoreData storage.md

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CoreDataStorage

CoreDataStorage is meant to be used with NSFetchedResultsController. It automatically monitors all NSFetchedResultsControllerDelegate methods and and calls delegate with appropriate updates.

let storage = CoreDataStorage(fetchedResultsController: controller)

Any section in CoreDataStorage conform to NSFetchedResultsSectionInfo protocol, however DTModelStorage extends them to be Section protocol compatible. This way CoreData sections and memory sections have the same interface.

UI Updates

StorageUpdate is created every time controllerWillChangeContent delegate method is called. Changes are collected into a single StorageUpdate instance, using controller(_:didChange:at:for:newIndexPath:) and controller(_:didChange:atSectionIndex:for:) delegate method.

After controllerDidChangeContent(_:) delegate method call, update is delivered to the delegate.

CoreData updater

When setting up CoreDataStorage with DTTableViewManager and DTCollectionViewManager, consider using special CoreData updater:

manager.collectionViewUpdater = manager.coreDataUpdater()

manager.tableViewUpdater = manager.coreDataUpdater()

This special version of updater has two important differences from default behavior:

  1. Moving items is animated as insert and delete
  2. When data model changes, update(with:) method and handler closure are called to update visible cells without explicitly reloading them.

Those are recommended by Apple approaches to handle NSFetchedResultsControllerDelegate updates with UITableView and UICollectionView. Those behaviours can be configured on both CollectionViewUpdater and TableViewUpdater classes.