SwiftUI not refresh my custom UIView with UIViewRepresentable & ObservableObject - swiftui

Question

I have
created a simple ARClass: ObservableObject with #Published var name: String
created a custom ARView: UIView that receives ARClass as a
parameter and draws a Text view displaying ARClass.name in the center
created UIViewRepresentable
and then used in SwiftUI View by using ARClass(color: .red, name: "Test Text") as an environment object in SceneDelegate
class ARClass: ObservableObject {
#Published var bg: UIColor
#Published var name: String
init(color: UIColor, name: String) {
self.bg = color
self.name = name
}
}
struct ARViewX: UIViewRepresentable {
var ar: ARClass
var frame: CGRect
func updateUIView(_ uiView: ARView, context: Context) {
uiView.frame = frame
uiView.ar = ar
uiView.setNeedsDisplay()
}
func makeUIView(context: Context) -> ARView {
ARView(ar: ar, frame: frame)
}
}
struct ContentView: View {
#EnvironmentObject var ar: ARClass
var body: some View {
GeometryReader { g in
VStack {
Spacer()
ARViewX(ar: self.ar, frame: CGRect(origin: .zero, size: .init(width: g.size.width, height: g.size.height/3)))
.padding()
Spacer()
Text(self.ar.name)
Divider()
TextField("Name", text: self.$ar.name)
.textFieldStyle(RoundedBorderTextFieldStyle())
.padding()
Spacer()
}
}
}
}
As I edited the TextField, the whole body is refreshed except the UIViewRepresentable. It always resets the 'name' variable to its initial value.

Answer 1

After hours finally I know that the updateUIView(_ uiView: ARView, context: Context) in UIViewRepresentable never got called so I modified the ARClass like this:
class ARClass: ObservableObject {
#Published var bg: UIColor
#Published var name: String {
didSet {
if let onNameChange = onNameChange {
onNameChange()
}
}
}
var onNameChange: (()->Void)?
init(color: UIColor, name: String) {
self.bg = color
self.name = name
}
}
And the UIViewRepresentable like this:
func updateUIView(_ uiView: ARView, context: Context) {
uiView.frame = frame
ar.onNameChange = {
uiView.setNeedsDisplay()
}
}