# reconfigureItems(_:) Updates the data for the items you specify in the snapshot, preserving the existing cells for the items. ``` mutating func reconfigureItems(_ identifiers: [ItemIdentifierType]) ``` ## Parameters `identifiers` An array of identifiers corresponding to the items to update data for in the snapshot. ## Discussion To update the contents of existing (including prefetched) cells without replacing them with new cells, use this method instead of [`reloadItems(_:)`](/documentation/UIKit/NSDiffableDataSourceSnapshot-swift.struct/reloadItems(_:)). For optimal performance, choose to reconfigure items instead of reloading items unless you have an explicit need to replace the existing cell with a new cell. Your cell provider must dequeue the same type of cell for the provided index path, and must return the same existing cell for a given index path. Because this method reconfigures existing cells, the collection view or table view doesn’t call `prepareForReuse` for each cell dequeued. If you need to return a different type of cell for an index path, use [`reloadItems(_:)`](/documentation/UIKit/NSDiffableDataSourceSnapshot-swift.struct/reloadItems(_:)) instead. If your cells are self-sizing, the collection view or table view resizes your cells after reconfiguring them. Set the `animatingDifferences` parameter to tell the collection view or table view whether to animate any size or layout changes that are a result of reconfiguration when you apply the snapshot to your data source. To avoid animations when setting specific properties, use [`performWithoutAnimation(_:)`](/documentation/UIKit/UIView/performWithoutAnimation(_:)) in your cell configuration logic. If your collection view or table view uses a diffable data source, use this method. If your collection view uses a custom implementation of `UICollectionViewDataSource`, use [`reconfigureItems(at:)`](/documentation/UIKit/UICollectionView/reconfigureItems(at:)) instead. If your table view uses a custom implementation of `UITableViewDataSource`, use [`reconfigureRows(at:)`](/documentation/UIKit/UITableView/reconfigureRows(at:)) instead. --- 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)