---
title: muteStateKey
framework: avfaudio
role: symbol
role_heading: Type Property
path: avfaudio/avaudioapplication/mutestatekey
---

# muteStateKey

A user information key to determine the app’s audio mute state.

## Declaration

```swift
class let muteStateKey: String
```

## Discussion

Discussion Use this key to retrieve the app’s mute state from an inputMuteStateChangeNotification.