---
title: NSClassDescriptionNeededForClass
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsnotification/name-swift.struct/nsclassdescriptionneededforclass
---

# NSClassDescriptionNeededForClass

Posted by init(for:) when a class description cannot be found for a class.

## Declaration

```swift
static let NSClassDescriptionNeededForClass: NSNotification.Name
```

## Discussion

Discussion After the notification is processed, init(for:) checks for a class description again. This checking allows an observer to register class descriptions lazily. The notification is posted only once for any given class, even if the class description remains undefined. The notification object is the class object for which the class description is requested. This notification does not contain a userInfo dictionary.