---
title: PropertyListenerDelegate
framework: Core Audio
role: symbol
role_heading: Protocol
platforms: [macOS 15.0+]
path: coreaudio/propertylistenerdelegate
---

# PropertyListenerDelegate

A delegate protocol for receiving notifications when properties registered with AudioHardwareObject.addPropertyListener change.

## Declaration

```swift
protocol PropertyListenerDelegate
```

## Topics

### Instance Methods

- [propertiesChanged(properties:)](coreaudio/propertylistenerdelegate/propertieschanged(properties:).md)