---
title: notificationIsPriorKey
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nskeyvaluechangekey/notificationispriorkey
---

# notificationIsPriorKey

If the prior option was specified when the observer was registered this notification is sent prior to a change.

## Declaration

```swift
static let notificationIsPriorKey: NSKeyValueChangeKey
```

## Discussion

Discussion The change dictionary contains an notificationIsPriorKey entry whose value is an NSNumber object that contains the Boolean value true.

## See Also

### Type Properties

- [indexesKey](foundation/nskeyvaluechangekey/indexeskey.md)
- [kindKey](foundation/nskeyvaluechangekey/kindkey.md)
- [newKey](foundation/nskeyvaluechangekey/newkey.md)
- [oldKey](foundation/nskeyvaluechangekey/oldkey.md)