---
title: thumbnailDictionaryKey
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/urlresourcekey/thumbnaildictionarykey
---

# thumbnailDictionaryKey

A dictionary of NSImage/UIImage objects keyed by size (read-write). See URLThumbnailDictionaryItem for a list of possible keys.

## Declaration

```swift
static let thumbnailDictionaryKey: URLResourceKey
```

## See Also

### Thumbnail keys

- [thumbnailKey](foundation/urlresourcekey/thumbnailkey.md)
- [URLThumbnailDictionaryItem](foundation/urlthumbnaildictionaryitem.md)