---
title: SKIndex
framework: Core Services
role: symbol
role_heading: Class
platforms: [Mac Catalyst 13.0+, macOS 10.3+]
path: coreservices/skindex
---

# SKIndex

Defines an opaque data type representing an index.

## Declaration

```swift
class SKIndex
```

## Overview

Overview A Search Kit index object contains the textual contents of one or more documents, as well as document URL objects (SKDocumentRefs) representing those documents’ locations. To create a new disk-based Search Kit index object, use SKIndexCreateWithURL(_:_:_:_:). To create a memory-based index, use SKIndexCreateWithMutableData(_:_:_:_:). For other operations on indexes, see Creating, Opening, and Closing Indexes and Managing Indexes. Also seeFast Asynchronous Searching. Special Considerations You cannot use CFMakeCollectable with SKIndex objects. In a garbage-collected environment, you must use SKIndexClose(_:) to dispose of an SKIndex object.