# selectionIndexPaths The set of index paths representing the currently selected items. ``` var selectionIndexPaths: Set { get set } ``` ## Discussion This property reflects the index paths of the currently selected items, where each index path contains a number and an index number for the in that section. This property is updated automatically when the user selects items interactively. You can also change the selection programmatically by assigning a new value to this property. To animate changes to the selection, call this method on the collection view’s [`animator()`](/documentation/AppKit/NSAnimatablePropertyContainer/animator()) proxy object instead. It is a programmer error to specify an index path that does not refer to a valid item in the data source. If you specify an invalid index path, this method raises an exception. This property is key-value observable. Other methods that modify the selection automatically update this property. --- 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)