# controller(_:sectionIndexTitleForSectionName:) Returns the name for a given section. ``` optional func controller(_ controller: NSFetchedResultsController, sectionIndexTitleForSectionName sectionName: String) -> String? ``` ## Parameters `controller` The fetched results controller that sent the message. `sectionName` The default name of the section. ## Return Value The string to use as the name for the specified section. ## Discussion This method does not enable change tracking. It is only needed if a section index is used. If the delegate doesn’t implement this method, the default implementation returns the capitalized first letter of the section name (see [`sectionIndexTitle(forSectionName:)`](/documentation/CoreData/NSFetchedResultsController/sectionIndexTitle(forSectionName:)) in `NSFetchedResultsController`). --- 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)