---
title: AVAudioUnitComponentManager.RegistrationsChangedMessage
framework: avfaudio
role: symbol
role_heading: Structure
path: avfaudio/avaudiounitcomponentmanager/registrationschangedmessage
---

# AVAudioUnitComponentManager.RegistrationsChangedMessage

Type-safe notification message for audio unit component registration changes.

## Declaration

```swift
struct RegistrationsChangedMessage
```

## Overview

Overview This notification is posted when the system’s audio component registrations have changed, such as when audio units are installed or removed. The notification object is the shared AVAudioUnitComponentManager instance.

## Relationships

### Conforms To

- [NotificationCenter.AsyncMessage](foundation/notificationcenter/asyncmessage.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Observing registration changes

- [registrationsChangedNotification](avfaudio/avaudiounitcomponentmanager/registrationschangednotification.md)