An example of a view with a segmented picker and a paginated tab view that are bound to each other

TabViewPickerBinding.swift

enum Page: Identifiable, CaseIterable {
    case first, second

    var title: String {
        switch self {
        case .first:
            return "First"
        case .second:
            return "Second"
        }
    }

    var id: Int {
        hashValue
    }
}

struct ContentView: View {
    @State private var selectedPage = Page.first

    var body: some View {
        VStack {
            Picker("Page picker", selection: $selectedPage.animation()) {
                ForEach(Page.allCases) { page in
                    Text(page.title)
                        .tag(page)
                }
            }
            .pickerStyle(SegmentedPickerStyle())

            TabView(selection: $selectedPage) {
                ForEach(Page.allCases) { page in
                    ZStack {
                        switch page {
                        case .first:
                            Text("First screen")
                        case .second:
                            Text("Second screen")
                        }
                    }
                    .tag(page)
                }
            }
            .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))
        }
        .padding()
    }
}