---
title: NSCollectionElementCategory.supplementaryView
framework: appkit
role: symbol
role_heading: Case
path: appkit/nscollectionelementcategory/supplementaryview
---

# NSCollectionElementCategory.supplementaryView

The element is a supplementary view. Use supplementary views for single views that contain some data but are associated with an entire section. For example, use them to specify header or footer views for a section.

## Declaration

```swift
case supplementaryView
```

## See Also

### Constants

- [NSCollectionElementCategory.item](appkit/nscollectionelementcategory/item.md)
- [NSCollectionElementCategory.decorationView](appkit/nscollectionelementcategory/decorationview.md)
- [NSCollectionElementCategory.interItemGap](appkit/nscollectionelementcategory/interitemgap.md)