<!--
{
  "availability" : [
    "macOS: 10.15.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AppKit",
  "identifier" : "/documentation/AppKit/NSCollectionLayoutSection/boundarySupplementaryItems",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AppKit"
    ],
    "preciseIdentifier" : "c:objc(cs)NSCollectionLayoutSection(py)boundarySupplementaryItems"
  },
  "title" : "boundarySupplementaryItems"
}
-->

# boundarySupplementaryItems

An array of the supplementary items that are associated with the boundary edges of the section, such as headers and footers.

```
var boundarySupplementaryItems: [NSCollectionLayoutBoundarySupplementaryItem] { get set }
```

---

Copyright &copy; 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)