---
title: old
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nskeyvalueobservingoptions/old
---

# old

Indicates that the change dictionary should contain the old attribute value, if applicable.

## Declaration

```swift
static var old: NSKeyValueObservingOptions { get }
```

## See Also

### Constants

- [new](foundation/nskeyvalueobservingoptions/new.md)
- [initial](foundation/nskeyvalueobservingoptions/initial.md)
- [prior](foundation/nskeyvalueobservingoptions/prior.md)