SwiftUI + RealityKit + ARSessionDelegate

Question

Created Jul ’20

Replies 3

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Views 2.8k

Participants 4

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.

Boost

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.

1

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.

1

Answer 3

kimate OP

Feb ’21

Sorry I am late but create a an ARSession delegate

0