---
title: QLPreviewItemLoadingBlock
framework: quicklookui
role: symbol
role_heading: Type Alias
path: quicklookui/qlpreviewitemloadingblock
---

# QLPreviewItemLoadingBlock

A type that defines a block used to load a Quick Look preview item.

## Declaration

```swift
typealias QLPreviewItemLoadingBlock = ((any Error)?) -> Void
```

## Discussion

Discussion A type that defines a block used to load a Quick Look preview item.

## See Also

### Previews

- [QLPreviewPanel](quicklookui/qlpreviewpanel.md)
- [QLPreviewView](quicklookui/qlpreviewview.md)
- [QLPreviewItem](quicklookui/qlpreviewitem.md)
- [QLPreviewPanelDataSource](quicklookui/qlpreviewpaneldatasource.md)
- [QLPreviewPanelDelegate](quicklookui/qlpreviewpaneldelegate.md)