---
title: "init(anchor:)"
framework: arkit
role: symbol
role_heading: Initializer
path: "arkit/aranchorcopying/init(anchor:)"
---

# init(anchor:)

Initializes a new anchor by copying custom information from another anchor.

## Declaration

```swift
init(anchor: ARAnchor)
```

## Parameters

- `anchor`: The other anchor from which to copy information.

## Discussion

Discussion Each time ARKit generates a new ARFrame object (corresponding to an incoming frame of live camera video at 60 fps), ARKit calls this initializer to copy each of the anchors associated with the previous frame. note: ARKit always calls this initializer with an anchor parameter of the same class as self. If you subclass ARAnchor to add extra properties, your implementation of this initializer should copy the values of those properties, then chain to the superclass initializer. For example, an AR game might define a BoardAnchor class to encode the position and size of a game board, so its version of this initializer would copy that size property: required init(anchor: ARAnchor) {     let other = anchor as! BoardAnchor     self.size = other.size     super.init(anchor: other) } important: Carefully consider performance and your app’s data model when storing references to other objects in anchors. Copying custom values might be expensive, but multiple references to the same data might or might not be correct for your app