---
title: identifier
framework: arkit
role: symbol
role_heading: Instance Property
path: arkit/aranchor/identifier
---

# identifier

A unique identifier for the anchor.

## Declaration

```swift
var identifier: UUID { get }
```

## Discussion

Discussion Whether an anchor is created manually (with the init(transform:) initializer) or automatically by ARKit (and provided to you through ARSessionDelegate, ARSCNViewDelegate, or ARSKViewDelegate methods), each anchor automatically receives a unique identifier value. You can use this value to determine which anchors accompanying a specific ARFrame capture correspond to anchors in frames captured previously.

## See Also

### Tracking Anchors

- [sessionIdentifier](arkit/aranchor/sessionidentifier.md)
- [transform](arkit/aranchor/transform.md)