---
title: willStartPlayback
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnaudioplayer/willstartplayback
---

# willStartPlayback

A block called by SceneKit when playback of the player’s audio source is about to begin.

## Declaration

```swift
var willStartPlayback: (() -> Void)? { get set }
```

## Discussion

Discussion The block takes no parameters and returns no value. Use this block to perform actions in response to the playing of sounds.

## See Also

### Responding to Playback

- [didFinishPlayback](scenekit/scnaudioplayer/didfinishplayback.md)