UIPageControl for use with SwiftUI. It has a two-way binding to a generic selection value.

PageControl.swift

import SwiftUI
import UIKit

struct PageControl<SelectionValue: Hashable>: UIViewRepresentable {
    let items: [SelectionValue]
    @Binding var selection: SelectionValue?
    
    func makeUIView(context: Context) -> UIPageControl {
        let pageControl = UIPageControl()
        pageControl.pageIndicatorTintColor = .gray
        pageControl.currentPageIndicatorTintColor = .black
        pageControl.addTarget(context.coordinator, action: #selector(Coordinator.valueDidChange), for: .valueChanged)
        return pageControl
    }
    
    func updateUIView(_ pageControl: UIPageControl, context: Context) {
        pageControl.numberOfPages = items.count
        if let selection, let selectedIndex = items.firstIndex(of: selection) {
            pageControl.currentPage = selectedIndex
        }
        context.coordinator.items = items
    }
    
    func sizeThatFits(_ proposal: ProposedViewSize, uiView: UIPageControl, context: Context) -> CGSize? {
        uiView.size(forNumberOfPages: items.count)
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(selection: $selection, items: items)
    }
    
    class Coordinator {
        @Binding var selection: SelectionValue?
        var items: [SelectionValue]
        
        init(selection: Binding<SelectionValue?>, items: [SelectionValue]) {
            self._selection = selection
            self.items = items
        }
        
        @objc func valueDidChange(_ sender: UIPageControl) {
            let selectedIndex = sender.currentPage
            assert(items.indices.contains(selectedIndex), "Invalid index received")
            withAnimation {
                selection = items[selectedIndex]
            }
        }
    }
}

private struct PageControl_Preview: View {
    @State var numbers: [Int] = [1, 2, 3, 4, 5]
    @State var selection: Int? = 1
    var body: some View {
        VStack {
            Text(verbatim: "Selected:")
            Text(selection ?? -1, format: .number)
            PageControl(items: numbers, selection: $selection)
                .border(.red)
            PageControl(items: numbers, selection: $selection)
                .border(.blue)
        }
    }
}

#Preview {
    PageControl_Preview()
}