---
title: QLNeedsToBeRunInMainThread
framework: bundleresources
role: symbol
role_heading: Property List Key
path: bundleresources/information-property-list/qlneedstoberuninmainthread
---

# QLNeedsToBeRunInMainThread

A Boolean value indicating whether a Quick Look app’s generator can be run in threads other than the main thread.

## See Also

### QuickLook

- [QLPreviewHeight](bundleresources/information-property-list/qlpreviewheight.md)
- [QLPreviewWidth](bundleresources/information-property-list/qlpreviewwidth.md)
- [QLSupportsConcurrentRequests](bundleresources/information-property-list/qlsupportsconcurrentrequests.md)
- [QLThumbnailMinimumSize](bundleresources/information-property-list/qlthumbnailminimumsize.md)