---
title: supplementaryContentInsetsReference
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/nscollectionlayoutsection/supplementarycontentinsetsreference
---

# supplementaryContentInsetsReference

The reference boundary for content insets on boundary supplementary items.

## Declaration

```swift
var supplementaryContentInsetsReference: UIContentInsetsReference { get set }
```

## Discussion

Discussion This property represents the reference boundary to use when defining contentInsets on NSCollectionLayoutBoundarySupplementaryItem objects. The default value of this property is UIContentInsetsReference.automatic, which means any insets specified on a NSCollectionLayoutBoundarySupplementaryItem follow the layout configuration’s contentInsetsReference.

## See Also

### Configuring section spacing

- [interGroupSpacing](uikit/nscollectionlayoutsection/intergroupspacing.md)
- [contentInsets](uikit/nscollectionlayoutsection/contentinsets.md)
- [contentInsetsReference](uikit/nscollectionlayoutsection/contentinsetsreference.md)
- [UIContentInsetsReference](uikit/uicontentinsetsreference.md)