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# CMTimebase.NotificationKey

Constants that describe notification keys.

```
struct NotificationKey
```

## Topics

### Notification Keys

[`static let eventTime: CMTimebase.NotificationKey`](/documentation/CoreMedia/CMTimebase/NotificationKey/eventTime)

A notification that posts by a timebase after a discontinuous time jump.

## Relationships

### Conforms To

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Hashable`](/documentation/Swift/Hashable)

[`Equatable`](/documentation/Swift/Equatable)

---

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