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# preparePreviewOfSearchableItem(identifier:queryString:completionHandler:)

Prepares the preview for a file by using the data from Spotlight’s searchable item.

```
optional func preparePreviewOfSearchableItem(identifier: String, queryString: String?, completionHandler handler: @escaping @Sendable ((any Error)?) -> Void)
```

## Parameters

`identifier`

The identifier of the searchable item.

`queryString`

A search string to associate with the searchable item.

`handler`

A completion handler that notifies the platform that a preview is available. The operating system shows a loading spinner, so call the handler as soon as possible. You can call the completion handler asynchronously after returning from the callback.

## Discussion

The operating system calls this method only once from the main thread before it presents the previewing controller. To avoid blocking the main thread, don’t perform long-running or resource-intensive work.

---

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