---
title: NSKeyValueObservingOptions
framework: foundation
role: symbol
role_heading: Structure
path: foundation/nskeyvalueobservingoptions
---

# NSKeyValueObservingOptions

The values that can be returned in a change dictionary.

## Declaration

```swift
struct NSKeyValueObservingOptions
```

## Overview

Overview These constants are passed to addObserver(_:forKeyPath:options:context:) and determine the values that are returned as part of the change dictionary passed to an observeValue(forKeyPath:of:change:context:). You can pass 0 if you require no change dictionary values.

## Topics

### Constants

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

### Initializers

- [init(rawValue:)](foundation/nskeyvalueobservingoptions/init(rawvalue:).md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [ExpressibleByArrayLiteral](swift/expressiblebyarrayliteral.md)
- [OptionSet](swift/optionset.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [SetAlgebra](swift/setalgebra.md)

## See Also

### Enumerations

- [NSGrammaticalCase](foundation/nsgrammaticalcase.md)
- [NSGrammaticalDefiniteness](foundation/nsgrammaticaldefiniteness.md)
- [NSGrammaticalDetermination](foundation/nsgrammaticaldetermination.md)
- [NSGrammaticalPerson](foundation/nsgrammaticalperson.md)
- [NSGrammaticalPronounType](foundation/nsgrammaticalpronountype.md)
- [NSKeyValueChange](foundation/nskeyvaluechange.md)
- [NSKeyValueSetMutationKind](foundation/nskeyvaluesetmutationkind.md)