---
title: CMSampleBuffer.NotificationKey
framework: coremedia
role: symbol
role_heading: Structure
path: coremedia/cmsamplebuffer/notificationkey
---

# CMSampleBuffer.NotificationKey

A key for sample buffer notifications.

## Declaration

```swift
struct NotificationKey
```

## Topics

### Keys

- [status](coremedia/cmsamplebuffer/notificationkey/status.md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Constants

- [CMSampleBuffer.Error](coremedia/cmsamplebuffer/error.md)
- [CMSampleBuffer.Flags](coremedia/cmsamplebuffer/flags.md)