---
title: UICollectionView.SupplementaryRegistration.Handler
framework: uikit
role: symbol
role_heading: Type Alias
path: uikit/uicollectionview/supplementaryregistration/handler
---

# UICollectionView.SupplementaryRegistration.Handler

A closure that handles the supplementary view registration and configuration.

## Declaration

```swift
typealias Handler = (Supplementary, String, IndexPath) -> Void
```

## See Also

### Creating a supplementary registration

- [init(elementKind:handler:)](uikit/uicollectionview/supplementaryregistration/init(elementkind:handler:).md)
- [init(supplementaryNib:elementKind:handler:)](uikit/uicollectionview/supplementaryregistration/init(supplementarynib:elementkind:handler:).md)