---
title: copyDescription
framework: corefoundation
role: symbol
role_heading: Instance Property
path: corefoundation/cfdictionarykeycallbacks/copydescription
---

# copyDescription

The callback used to create a descriptive string representation of each key in the dictionary. If NULL, the collection will create a simple description of each key. See CFDictionaryCopyDescriptionCallBack for a description of this callback.

## Declaration

```swift
var copyDescription: CFDictionaryCopyDescriptionCallBack!
```