---
title: "addTrackingArea(identifier:)"
framework: compositorservices
role: symbol
role_heading: Instance Method
path: "compositorservices/layerrenderer/drawable/addtrackingarea(identifier:)"
---

# addTrackingArea(identifier:)

Returns a tracking area which is create on the drawable’s list of tracking areas.

## Declaration

```swift
func addTrackingArea(identifier: LayerRenderer.Drawable.TrackingArea.Identifier) -> LayerRenderer.Drawable.TrackingArea
```

## Parameters

- `identifier`: The unique identifier for the tracking area.

## Return Value

Return Value A tracking area that was created.

## Discussion

Discussion A tracking area describes a region of a view that interacts with the gaze/cursor. Cannot use cp_tracking_area_identifier_invalid as an identifier.