---
title: willExpandItem
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/uicollectionviewdiffabledatasource-9tqpa/sectionsnapshothandlers-swift.struct/willexpanditem
---

# willExpandItem

The handler that prepares the diffable data source for expanding an item.

## Declaration

```swift
var willExpandItem: ((ItemIdentifierType) -> Void)? { get set }
```

## See Also

### Expanding and collapsing items

- [shouldCollapseItem](uikit/uicollectionviewdiffabledatasource-9tqpa/sectionsnapshothandlers-swift.struct/shouldcollapseitem.md)
- [shouldExpandItem](uikit/uicollectionviewdiffabledatasource-9tqpa/sectionsnapshothandlers-swift.struct/shouldexpanditem.md)
- [willCollapseItem](uikit/uicollectionviewdiffabledatasource-9tqpa/sectionsnapshothandlers-swift.struct/willcollapseitem.md)
- [snapshotForExpandingParent](uikit/uicollectionviewdiffabledatasource-9tqpa/sectionsnapshothandlers-swift.struct/snapshotforexpandingparent.md)