# controller(_:didChangeContentWith:) Notifies the receiver about changes to the content in the fetched results controller, by using a diffable data source snapshot. ``` optional func controller(_ controller: NSFetchedResultsController, didChangeContentWith snapshot: NSDiffableDataSourceSnapshot) ``` ## Discussion To apply the changes, call on the collection or table view’s data source. If this method is implemented, no other delegate methods are invoked. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)