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# version(itemAt:forPersistentIdentifier:)

Returns the version of the file that has the specified persistent ID.

```
class func version(itemAt url: URL, forPersistentIdentifier persistentIdentifier: Any) -> NSFileVersion?
```

## Parameters

`url`

The URL of the file whose version you want.

`persistentIdentifier`

The persistent ID of the `NSFileVersion` object you want.

## Return Value

The file version object with the specified ID or `nil` if no such version object exists.

## See Also

[`persistentIdentifier`](/documentation/Foundation/NSFileVersion/persistentIdentifier)

The identifier for this version of the file.


---

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