Scroll offset

import SwiftUI

struct ContentView: View {
    @State private var scrollOffset: CGFloat = 0

    var body: some View {
        ScrollView {
            GeometryReader { geometry in
                Color.clear
                    .preference(key: ScrollOffsetPreferenceKey.self, value: geometry.frame(in: .global).minY)
            }
            .frame(height: 0)

            VStack {
                ForEach(0..<100) { index in
                    Text("Item \(index)")
                        .padding()
                }
            }
        }
        .onPreferenceChange(ScrollOffsetPreferenceKey.self) { value in
            scrollOffset = value
            print("Scroll offset: \(scrollOffset)")
        }
    }
}

struct ScrollOffsetPreferenceKey: PreferenceKey {
    typealias Value = CGFloat
    static var defaultValue: CGFloat = 0
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = nextValue()
    }
}