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# rateDidChangeNotification

A notification that a player posts when its rate changes.

```
class let rateDidChangeNotification: NSNotification.Name
```

## Discussion

Observing this notification is similar to key-value observing the rate property, except the notification provides additional information about the rate change in the user information dictionary.

## Topics

### User information keys

[`rateDidChangeOriginatingParticipantKey`](/documentation/AVFoundation/AVPlayer/rateDidChangeOriginatingParticipantKey)

A key to retrieve the identifier of the participant that originates the rate change.

[`rateDidChangeReasonKey`](/documentation/AVFoundation/AVPlayer/rateDidChangeReasonKey)

A key to retrieve the reason for the rate change.

[`AVPlayer.RateDidChangeReason`](/documentation/AVFoundation/AVPlayer/RateDidChangeReason)

A structure that represents a rate change reason.


---

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