---
title: kCFURLKeysOfUnsetValuesKey
framework: corefoundation
role: symbol
role_heading: Global Variable
path: corefoundation/kcfurlkeysofunsetvalueskey
---

# kCFURLKeysOfUnsetValuesKey

Key for the resource properties that have not been set after the CFURLSetResourcePropertiesForKeys(_:_:_:) function returns an error, returned as an array of CFString objects.

## Declaration

```swift
let kCFURLKeysOfUnsetValuesKey: CFString!
```