---
title: CMTimebase.NotificationKey
framework: coremedia
role: symbol
role_heading: Structure
path: coremedia/cmtimebase/notificationkey
---

# CMTimebase.NotificationKey

Constants that describe notification keys.

## Declaration

```swift
struct NotificationKey
```

## Topics

### Notification Keys

- [eventTime](coremedia/cmtimebase/notificationkey/eventtime.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

- [CMTimebase.Error](coremedia/cmtimebase/error.md)
- [typeID](coremedia/cmtimebase/typeid.md)