---
title: "setTagData(_:forItemIdentifier:completionHandler:)"
framework: fileprovider
role: symbol
role_heading: Instance Method
path: "fileprovider/nsfileproviderextension/settagdata(_:foritemidentifier:completionhandler:)"
---

# setTagData(_:forItemIdentifier:completionHandler:)

Tags an item.

## Declaration

```swift
func setTagData(_ tagData: Data?, forItemIdentifier itemIdentifier: NSFileProviderItemIdentifier, completionHandler: @escaping @Sendable (NSFileProviderItem?, (any Error)?) -> Void)
```

```swift
func setTagData(_ tagData: Data?, forItemIdentifier itemIdentifier: NSFileProviderItemIdentifier) async throws -> NSFileProviderItem
```

## Parameters

- `tagData`: The tag selected by the user, or nil if the item was untagged.
- `itemIdentifier`: The item’s persistent identifier.
- `completionHandler`: A block that takes the following parameters:

## Discussion

Discussion important: You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration: func setTagData(_ tagData: Data?, forItemIdentifier itemIdentifier: NSFileProviderItemIdentifier) async throws -> NSFileProviderItem For information about concurrency and asynchronous code in Swift, see Calling Objective-C APIs Asynchronously. This method is called when the user tags a document or directory. Override this method to make any necessary local changes. Your implementation should return immediately. Call the completion handler before performing any network activity or other long-running tasks. Defer these tasks to the background. The taggedItem instance that you pass to the completion handler should match the item’s old file provider item, with only one change: set the item’s tagData property with the value of the tagData parameter. Always include Items with a non-nil tagData property in your File Provider extension’s working set.

## See Also

### Handling actions

- [Providing support for user-driven actions](fileprovider/providing-support-for-user-driven-actions.md)
- [createDirectory(withName:inParentItemIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/createdirectory(withname:inparentitemidentifier:completionhandler:).md)
- [deleteItem(withIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/deleteitem(withidentifier:completionhandler:).md)
- [importDocument(at:toParentItemIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/importdocument(at:toparentitemidentifier:completionhandler:).md)
- [renameItem(withIdentifier:toName:completionHandler:)](fileprovider/nsfileproviderextension/renameitem(withidentifier:toname:completionhandler:).md)
- [reparentItem(withIdentifier:toParentItemWithIdentifier:newName:completionHandler:)](fileprovider/nsfileproviderextension/reparentitem(withidentifier:toparentitemwithidentifier:newname:completionhandler:).md)
- [setFavoriteRank(_:forItemIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/setfavoriterank(_:foritemidentifier:completionhandler:).md)
- [setLastUsedDate(_:forItemIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/setlastuseddate(_:foritemidentifier:completionhandler:).md)
- [trashItem(withIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/trashitem(withidentifier:completionhandler:).md)
- [untrashItem(withIdentifier:toParentItemIdentifier:completionHandler:)](fileprovider/nsfileproviderextension/untrashitem(withidentifier:toparentitemidentifier:completionhandler:).md)