Method `enumerateChildNodes` is not finding nodes - swift

Question

I'm developing an ARKit app that has 2 buttons: "Play" and "Reset". When I click on Play, a pyramid node is displayed. When I click on Reset, all pyramid nodes should be deleted from the scene:
Another requirement is that I want to disable the Play button when I click on it.
Next is my contentView code:
import ARKit
struct ContentView: View {
#State var node = SCNNode()
#State var play: Bool = false
#State var reset: Bool = false
#State var isDisabled: Bool = false
#State var showBanner:Bool = true
var body: some View {
ZStack {
SceneKitView(node: $node, play: $play, reset: $reset, isDisabled: $isDisabled)
VStack {
Spacer()
HStack {
Button(action: {
play = true
}) {
Image("Play")
}.padding()
.disabled(isDisabled) /// <<<<< THIS DISABLES THE BUTTON
Spacer()
Button(action: {
play = false
reset = true
}) {
Image("Reset")
}.padding()
}
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
In order to disable the Play button, I'm using a .disabled and the Boolean isDisabled.
My code changes the value of isDisabled to TRUE in a Coordinator :
import ARKit
import SwiftUI
struct SceneKitView: UIViewRepresentable {
let arView = ARSCNView(frame: .zero)
let config = ARWorldTrackingConfiguration()
#Binding var node: SCNNode
#Binding var play: Bool
#Binding var reset: Bool
#Binding var isDisabled: Bool
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
final class Coordinator: NSObject, ARSCNViewDelegate {
var control: SceneKitView
init(_ control: SceneKitView) {
self.control = control
}
func renderer(_ renderer: SCNSceneRenderer, willRenderScene scene: SCNScene, atTime time: TimeInterval) {
DispatchQueue.main.async {
if self.control.play {
self.control.addNode()
self.control.play = false
self.control.isDisabled = true // HERE I UPDATE THE VALUE !!!!!!!!
self.control.reset = false
}else{
}
}
}
}
func removeNode(){
self.arView.scene.rootNode.enumerateChildNodes { (node, _) in
print("existing nodes = \(node)")
node.removeFromParentNode()
}
}
func updateUIView(_ uiView: ARSCNView,
context: Context) {
if self.reset {
self.removeNode()
print("game reseted")
}
}
func makeUIView(context: Context) -> ARSCNView {
arView.scene = SCNScene()
arView.delegate = context.coordinator
arView.autoenablesDefaultLighting = true
//arView.debugOptions = [ARSCNDebugOptions.showFeaturePoints, ARSCNDebugOptions.showWorldOrigin]
arView.showsStatistics = true
arView.session.run(self.config)
return arView
}
func addNode(){
let pyramid = SCNNode(geometry: SCNPyramid(width: 0.1, height: 0.1, length: 0.1))
pyramid.geometry?.firstMaterial?.diffuse.contents = UIColor.red
pyramid.geometry?.firstMaterial?.specular.contents = UIColor.white
pyramid.position = SCNVector3(0,0,-0.5)
self.arView.scene.rootNode.addChildNode(pyramid)
}
}
Problem: When the app is running and I click on RESET, the method removeNode is invoked and this method uses enumerateChildNodes to find the nodes and delete them using removeFromParentNode but the pyramid node is not removed ! :(
The crazy thing (for me) is that if I don't change the value of isDisabled in the Coordinator, i.e. I comment that line, removeNode works, and the node is removed !!!!!
Any comment, suggestion is welcome :)

Answer 1

This solves the issue:
func updateUIView(_ uiView: ARSCNView, context: Context) {
if self.reset {
DispatchQueue.main.async {
context.coordinator.control.removeNode()
context.coordinator.control.isDisabled = false
}
print("Game Reset")
}
}