---
title: kCFURLIsMountTriggerKey
framework: corefoundation
role: symbol
role_heading: Global Variable
path: corefoundation/kcfurlismounttriggerkey
---

# kCFURLIsMountTriggerKey

Key for determining whether the URL is a file system trigger directory, returned as a CFBoolean object. Traversing or opening a file system trigger directory causes an attempt to mount a file system on the directory.

## Declaration

```swift
let kCFURLIsMountTriggerKey: CFString!
```

## See Also

### Constants

- [kCFURLFileAllocatedSizeKey](corefoundation/kcfurlfileallocatedsizekey.md)
- [kCFURLFileSizeKey](corefoundation/kcfurlfilesizekey.md)
- [kCFURLIsAliasFileKey](corefoundation/kcfurlisaliasfilekey.md)
- [kCFURLTotalFileAllocatedSizeKey](corefoundation/kcfurltotalfileallocatedsizekey.md)
- [kCFURLTotalFileSizeKey](corefoundation/kcfurltotalfilesizekey.md)