---
title: didChangeNotification
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsfontcollection/didchangenotification
---

# didChangeNotification

Posted whenever a font collection is changed.

## Declaration

```swift
class let didChangeNotification: NSNotification.Name
```

## Discussion

Discussion The notification’s object is the font collection that was affected. The notification’s userInfo dictionary contains information about the the collection change containing the keys defined in NSFontCollection.UserInfoKey and the corresponding values. To observe this notification using Swift concurrency, use NSFontCollection.DidChangeMessage.

## See Also

### Responding to Changes

- [NSFontCollection.UserInfoKey](appkit/nsfontcollection/userinfokey.md)
- [NSFontCollection.ActionTypeKey](appkit/nsfontcollection/actiontypekey.md)