---
title: invalidate()
framework: AudioAccessoryKit
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+]
path: audioaccessorykit/audioaccessoryheadtracking/handler/invalidate()
---

# invalidate()

Called when the head-tracking session has been invalidated.

## Declaration

```swift
func invalidate()
```

## Discussion

Discussion After this is called, no further state updates will be delivered on this handler, and the session is no longer valid for forwarding sensor data.