---
title: invalidatedDecorationIndexPaths
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nscollectionviewlayoutinvalidationcontext/invalidateddecorationindexpaths
---

# invalidatedDecorationIndexPaths

A dictionary containing the decoration views whose layout attributes are invalid.

## Declaration

```swift
var invalidatedDecorationIndexPaths: [NSCollectionView.DecorationElementKind : Set<IndexPath>]? { get }
```

## Discussion

Discussion The keys in this dictionary are the element kind strings of the decoration views. The value for each key is an NSSet object containing one or more NSIndexPath objects, each of which identifies the section containing the decoration view.

## 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)
- [invalidatedItemIndexPaths](appkit/nscollectionviewlayoutinvalidationcontext/invalidateditemindexpaths.md)
- [invalidatedSupplementaryIndexPaths](appkit/nscollectionviewlayoutinvalidationcontext/invalidatedsupplementaryindexpaths.md)