SwiftUI如何记录当前显示在CollectionView上的网格项目的索引？

import SwiftUI

struct ContentView: View {
    @State private var currentIndex: Int = 0
    
    var body: some View {
        VStack {
            Text("Current Index: \(currentIndex)")
            
            ScrollView {
                LazyVGrid(columns: [GridItem(.adaptive(minimum: 80))]) {
                    ForEach(0..<100) { index in
                        Text("\(index)")
                            .frame(width: 80, height: 80)
                            .background(index == currentIndex ? Color.blue : Color.gray)
                            .onTapGesture {
                                currentIndex = index
                            }
                    }
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}