---
title: NSFontCollection.UserInfoKey
framework: appkit
role: symbol
role_heading: Structure
path: appkit/nsfontcollection/userinfokey
---

# NSFontCollection.UserInfoKey

These constants are used as keys in the didChangeNotification userInfo dictionary to indicate the changes that have taken place.

## Declaration

```swift
struct UserInfoKey
```

## Topics

### User Info Keys

- [actionUserInfoKey](appkit/nsfontcollection/actionuserinfokey.md)
- [nameUserInfoKey](appkit/nsfontcollection/nameuserinfokey.md)
- [oldNameUserInfoKey](appkit/nsfontcollection/oldnameuserinfokey.md)
- [visibilityUserInfoKey](appkit/nsfontcollection/visibilityuserinfokey.md)

### Initializers

- [init(rawValue:)](appkit/nsfontcollection/userinfokey/init(rawvalue:).md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Responding to Changes

- [didChangeNotification](appkit/nsfontcollection/didchangenotification.md)
- [NSFontCollection.ActionTypeKey](appkit/nsfontcollection/actiontypekey.md)