SwiftUI + RealityKit + ARSessionDelegate

Question

Created Jul ’20

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I am wondering how I can edit the func session(_ session: ARSession, didAdd anchors: [ARAnchor]) in the arView.session.delegate. I would like to run a function when the image is recognized.

Code Block swiftstruct ARViewWrapper: UIViewRepresentable {  let title: String  typealias UIViewType = ARView     func makeUIView(context: Context) -> ARView {    print("detected?")    let arView = ARView(frame: .zero, cameraMode: .ar, automaticallyConfigureSession: true)    let target = AnchorEntity(.image(group: "AR Resources", name: "qr1"))    arView.scene.anchors.append(target)    addARObjs(anchor: target, title: title, planeColor: .blue)    return arView  }     func updateUIView(_ uiView: ARView, context: Context) {    print("update!")    return()  }}

Any and all guidance is appreciated! Thanks in advance.

Answered by DTS Engineer in 623604022

Hello,

You should create a Coordinator object to act as your ARSessionDelegate. See the Interfacing with UIKit SwiftUI Tutorial for an example that uses a Coordinator.

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Answer 1

rocketar OP

Jul ’20

I believe that what you want to try is when the anchor state changes on your AnchorEntity.
For that you can subscribe to SceneEvents.AnchoredStateChanged.

an example of that might look like:

Code Block swiftvar eventSub: Cancellable?eventSub = self.scene.subscribe(	to: SceneEvents.AnchoredStateChanged.self,	on: target) { event in	if event.isAnchored {		// image found	}}

You must import the framework Combine to use Cancellable.

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Answer 2

DTS Engineer OP

Apple

Jul ’20

Accepted Answer

Hello,

You should create a Coordinator object to act as your ARSessionDelegate. See the Interfacing with UIKit SwiftUI Tutorial for an example that uses a Coordinator.

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Answer 3

kimate OP

Feb ’21

Sorry I am late but create a an ARSession delegate

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