---
title: invalidatedItemIndexPaths
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nscollectionviewlayoutinvalidationcontext/invalidateditemindexpaths
---

# invalidatedItemIndexPaths

The set of items whose layout attributes are invalid.

## Declaration

```swift
var invalidatedItemIndexPaths: Set<IndexPath>? { get }
```

## Discussion

Discussion The set contains zero or more NSIndexPath objects, each of which identifies an invalid item.

## See Also

### Invalidating Specific Items

- [invalidateItems(at:)](appkit/nscollectionviewlayoutinvalidationcontext/invalidateitems(at:).md)
- [invalidateSupplementaryElements(ofKind:at:)](appkit/nscollectionviewlayoutinvalidationcontext/invalidatesupplementaryelements(ofkind:at:).md)
- [invalidateDecorationElements(ofKind:at:)](appkit/nscollectionviewlayoutinvalidationcontext/invalidatedecorationelements(ofkind:at:).md)
- [invalidatedSupplementaryIndexPaths](appkit/nscollectionviewlayoutinvalidationcontext/invalidatedsupplementaryindexpaths.md)
- [invalidatedDecorationIndexPaths](appkit/nscollectionviewlayoutinvalidationcontext/invalidateddecorationindexpaths.md)