---
title: providerIdentifier
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/uidocumentpickerextensionviewcontroller/provideridentifier
---

# providerIdentifier

An identifier shared by this Document Picker extension and its corresponding File Provider extension. (read-only)

## Declaration

```swift
var providerIdentifier: String { get }
```

## Discussion

Discussion Both the Document Picker View Controller extension and the File Provider extension should pass this identifier to their file coordinator’s setPurposeIdentifier: method. This approach helps coordinate the read and write operations between the two extensions, preventing possible deadlocks. This property holds the value returned by calling the File Provider extension’s providerIdentifier method.

## See Also

### Managing the user interface

- [dismissGrantingAccess(to:)](uikit/uidocumentpickerextensionviewcontroller/dismissgrantingaccess(to:).md)
- [documentPickerMode](uikit/uidocumentpickerextensionviewcontroller/documentpickermode.md)
- [documentStorageURL](uikit/uidocumentpickerextensionviewcontroller/documentstorageurl.md)
- [originalURL](uikit/uidocumentpickerextensionviewcontroller/originalurl.md)
- [prepareForPresentation(in:)](uikit/uidocumentpickerextensionviewcontroller/prepareforpresentation(in:).md)
- [validTypes](uikit/uidocumentpickerextensionviewcontroller/validtypes.md)