---
title: rateDidChangeReasonKey
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avplayer/ratedidchangereasonkey
---

# rateDidChangeReasonKey

A key to retrieve the reason for the rate change.

## Declaration

```swift
class let rateDidChangeReasonKey: String
```

## Mentioned in

Controlling the transport behavior of a player

## See Also

### User information keys

- [rateDidChangeOriginatingParticipantKey](avfoundation/avplayer/ratedidchangeoriginatingparticipantkey.md)
- [AVPlayer.RateDidChangeReason](avfoundation/avplayer/ratedidchangereason.md)