Optional selection

Selection.swift

//: A UIKit based Playground for presenting user interface
  
import UIKit
import SwiftUI
import PlaygroundSupport

struct ContentView: View {

    @State var selected: Int? = 1
    
    var body: some View {
        TabView(selection: $selected) {
            Text("First View")
                .tabItem {
                    Image(systemName: "1.circle")
                    Text("First")
                }
                .tag(Optional(0))
            Text("Second View")
                .tabItem {
                    Image(systemName: "2.circle")
                    Text("Second")
                }
                .tag(Optional(1))
            Text("Third View")
                .tabItem {
                    Image(systemName: "3.circle")
                    Text("Third")
                }
                .tag(Optional(2))
        }
        .tabViewStyle(.page)
    }
    
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = UIHostingController(rootView: ContentView())