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# ARSessionDelegate

Methods you can implement to receive captured video frame images and tracking state from an AR session.

```
protocol ARSessionDelegate : ARSessionObserver
```

## Overview

Implement this protocol if you need to work directly with [`ARFrame`](/documentation/ARKit/ARFrame) objects captured by the session or directly follow changes to the session’s set of tracked [`ARAnchor`](/documentation/ARKit/ARAnchor) objects. Typically, you adopt this protocol when building a custom view for displaying AR content—if you display content with SceneKit or SpriteKit, the [`ARSCNViewDelegate`](/documentation/ARKit/ARSCNViewDelegate) and [`ARSKViewDelegate`](/documentation/ARKit/ARSKViewDelegate) protocols provide similar information and integrate with those technologies.

This protocol extends the [`ARSessionObserver`](/documentation/ARKit/ARSessionObserver) protocol, so your session delegate can also implement those methods to respond to changes in session status.

## Topics

### Receiving Camera Frames

[`session(_:didUpdate:)`](/documentation/ARKit/ARSessionDelegate/session(_:didUpdate:)-9v2kw)

Provides a newly captured camera image and accompanying AR information to the delegate.

### Handling Content Updates

[`session(_:didAdd:)`](/documentation/ARKit/ARSessionDelegate/session(_:didAdd:))

Tells the delegate that one or more anchors have been added to the session.

[`session(_:didUpdate:)`](/documentation/ARKit/ARSessionDelegate/session(_:didUpdate:)-3qtt8)

Tells the delegate that the session has adjusted the properties of one or more anchors.

[`session(_:didRemove:)`](/documentation/ARKit/ARSessionDelegate/session(_:didRemove:))

Tells the delegate that one or more anchors have been removed from the session.


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