How to add 3D shapes in Swift UI? - swift

Question

I want to know how to add 3D shapes (eg. Sphere) in swift UI
I have tried adding a scnscene and using that in swift UI but I get a error message
//SceneKit
class myscene: SCNScene{
override init(){
super.init()
}
required init?(coder: NSCoder) {
fatalError("init(coder: ) has not been implemented")
}
}
//Swift UI
struct ContentView: View {
var body: some View {
let sphere = SCNSphere(radius: 2.0)
sphere.firstMaterial?.diffuse.contents = UIColor.blue
let spherenode = SCNNode(geometry: sphere)
spherenode.position = SCNVector3(x: 0.0, y: 3.0, z: 0.0)
}
}
The error message is on var body: some View { line and reads as follows :
Function declares an opaque return type, but has no return statements in its body from which to infer an underlying type
Please help me with this problem......

Answer 1

Here is simplest code to demo how to setup SceneKit scene with your sphere. Hope it helps.
import SwiftUI
import SceneKit
struct SceneKitView: UIViewRepresentable {
func makeUIView(context: UIViewRepresentableContext<SceneKitView>) -> SCNView {
let sceneView = SCNView()
sceneView.scene = SCNScene()
sceneView.allowsCameraControl = true
sceneView.autoenablesDefaultLighting = true
sceneView.backgroundColor = UIColor.black
let sphere = SCNSphere(radius: 2.0)
sphere.firstMaterial?.diffuse.contents = UIColor.blue
let spherenode = SCNNode(geometry: sphere)
spherenode.position = SCNVector3(x: 0.0, y: 3.0, z: 0.0)
sceneView.scene?.rootNode.addChildNode(spherenode)
return sceneView
}
func updateUIView(_ uiView: SCNView, context: UIViewRepresentableContext<SceneKitView>) {
}
typealias UIViewType = SCNView
}
struct DemoSceneKit: View {
var body: some View {
SceneKitView()
}
}
struct DemoSceneKit_Previews: PreviewProvider {
static var previews: some View {
DemoSceneKit()
}
}