---
title: "cancel(_:)"
framework: quicklookthumbnailing
role: symbol
role_heading: Instance Method
path: "quicklookthumbnailing/qlthumbnailgenerator/cancel(_:)"
---

# cancel(_:)

Cancels the generation of a thumbnail for a given request.

## Declaration

```swift
func cancel(_ request: QLThumbnailGenerator.Request)
```

## Parameters

- `request`: The thumbnail creation request that you want to cancel.

## Mentioned in

Creating Quick Look Thumbnails to Preview Files in Your App