I've a little trouble with implement a changeText function. PlaneDetection works, the first text displayed correctly. Once I hit on the button which linked to the changeText() function and it stop working. The error shows something about upwarpping optional value with arView, I tried everything I could still didn't work at all. So anyone please help me, I'm new in here.
Error:
AR3DText/ContentView.swift:18: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value 2021-10-24 13:18:53.331758-0700 AR3DText[8026:2401109] AR3DText/ContentView.swift:18: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value (lldb)
import SwiftUI
import RealityKit
import ARKit
struct ContentView : View {
var body: some View {
return ARViewContainer()
.overlay(
VStack{
Spacer()
Button(action:{arView.changeText("Frank is awesome")}) {
Text("Change Text")
.frame(width:120,height:40)
.font(.body)
.foregroundColor(.black)
.background(Color.white)
.opacity(0.6)
}
.offset(y:-30)
.padding(.bottom, 30)
}
)
.edgesIgnoringSafeArea(.all)
}
}
struct ARViewContainer: UIViewRepresentable {
func makeUIView(context: Context) -> ARView {
let arView = ARView(frame: .zero)
let config = ARWorldTrackingConfiguration()
config.planeDetection = .horizontal
arView.session.run(config, options: [])
arView.session.delegate = arView
arView.createPlane()
return arView
}
func updateUIView(_ uiView: ARView, context: Context) {}
}
var arView: ARView!
var textElement = TextElements()
var textEntity: ModelEntity!
var planeAnchor: AnchorEntity!
extension ARView: ARSessionDelegate {
func createPlane() {
let planeAcnchor = AnchorEntity(plane: .horizontal)
let textMesh: MeshResource = .generateText("Hello Frank!", extrusionDepth: textElement.extrusionDepth, font: textElement.font, containerFrame: CGRect(), alignment: .left, lineBreakMode: .byWordWrapping)
let textMaterial = SimpleMaterial(color: textElement.textColor, isMetallic: true)
let textEntity = ModelEntity(mesh: textMesh, materials: [textMaterial])
textEntity.generateCollisionShapes(recursive: false)
planeAcnchor.addChild(textEntity)
self.scene.addAnchor(planeAcnchor)
self.installGestures(.all, for: textEntity)
}
func changeText(_ textContent: String) {
let textMesh: MeshResource = .generateText(textContent, extrusionDepth: textElement.extrusionDepth, font: textElement.font, containerFrame: CGRect(), alignment: .left, lineBreakMode: .byWordWrapping)
let textMaterial = SimpleMaterial(color: .blue, isMetallic: false)
textEntity.removeFromParent()
let textEntity = ModelEntity(mesh: textMesh, materials: [textMaterial])
planeAnchor.addChild(textEntity)
self.scene.addAnchor(planeAnchor)
self.installGestures(.all, for: textEntity)
}
}
#if DEBUG
struct ContentView_Previews : PreviewProvider {
static var previews: some View {
ContentView()
}
}
#endif