StateTests.swift

struct ContentView: View {
    @State var flip = false
    
    var body: some View {
        VStack {
            Toggle("Refresh", isOn: $flip)
                .toggleStyle(.switch)
            StateSubView(model: .init(source: "State subview"))
            ObservedSubView(model: .init(source: "Observed subview"))
        }
        .padding()
    }
}

struct StateSubView: View {
    @StateObject var model: Model
    
    var body: some View {
        Color.clear
    }
}

struct ObservedSubView: View {
    @ObservedObject var model: Model
    
    var body: some View {
        Color.clear
    }
}

class Model: ObservableObject {
    init(source: String) {
        print("Init Model from \(source)")
    }
}