---
title: NSMetadataQueryUpdateChangedItemsKey
framework: foundation
role: symbol
role_heading: Global Variable
path: foundation/nsmetadataqueryupdatechangeditemskey
---

# NSMetadataQueryUpdateChangedItemsKey

The key for retrieving an array of items that have changed in the query result. By default, this array contains NSMetadataItem objects, representing the query’s results; however, the query’s delegate can substitute these objects with instances of a different class.

## Declaration

```swift
let NSMetadataQueryUpdateChangedItemsKey: String
```

## See Also

### Constants

- [NSMetadataQueryUpdateAddedItemsKey](foundation/nsmetadataqueryupdateaddeditemskey.md)
- [NSMetadataQueryUpdateRemovedItemsKey](foundation/nsmetadataqueryupdateremoveditemskey.md)