---
title: willReorder
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/uicollectionviewdiffabledatasource-9tqpa/reorderinghandlers-swift.struct/willreorder
---

# willReorder

The handler that prepares the diffable data source for reordering its items.

## Declaration

```swift
var willReorder: ((NSDiffableDataSourceTransaction<SectionIdentifierType, ItemIdentifierType>) -> Void)? { get set }
```

## See Also

### Reordering items

- [canReorderItem](uikit/uicollectionviewdiffabledatasource-9tqpa/reorderinghandlers-swift.struct/canreorderitem.md)
- [didReorder](uikit/uicollectionviewdiffabledatasource-9tqpa/reorderinghandlers-swift.struct/didreorder.md)