---
title: CMAttachmentKeyDefinitions
framework: Core Media
role: symbol
role_heading: Type Alias
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: coremedia/cmattachmentkeydefinitions
---

# CMAttachmentKeyDefinitions

## Declaration

```swift
typealias CMAttachmentKeyDefinitions = CVAttachmentKeyDefinitions
```