---
title: invalid
framework: compositorservices
role: symbol
role_heading: Type Property
path: compositorservices/layerrenderer/drawable/trackingarea/identifier-swift.struct/invalid
---

# invalid

Identifier reserved as invalid.

## Declaration

```swift
static let invalid: LayerRenderer.Drawable.TrackingArea.Identifier
```

## Discussion

Discussion Should not be used as identifier for addTrackingArea(identifier:).