ScrollView with divider

ContentView.swift

struct SearchView: NSViewRepresentable {
    typealias NSViewType = NSSearchField
    
    func makeNSView(context: Context) -> NSSearchField {
        return NSSearchField()
    }
    
    func updateNSView(_ nsView: NSSearchField, context: Context) {
        
    }
}

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

struct SidebarView: View {
    @State private var scrollPosition: CGFloat = 0
    
    var body: some View {
        VStack {
            SearchView()
            Divider().opacity(scrollPosition < 0 ? 1 : 0)
            ScrollView(content: {
                ZStack {
                    HStack {}
                    GeometryReader(content: { geometry in
                        GeometryReader { proxy in
                            let offset = proxy.frame(in: .named("scroll")).minY
                            Color.clear.preference(key: ScrollViewOffsetPreferenceKey.self, value: offset)
                        }
                    })
                }
                .frame(height: 1)
                .padding(0)
                ForEach(0..<50, id: \.self, content: { item in
                    HStack(alignment: .center) {
                        Text("Item")
                        Spacer()
                        Text(item.description)
                    }
                })
            })
            .frame(height: 300)
            .coordinateSpace(name: "scroll")
            .onPreferenceChange(ScrollViewOffsetPreferenceKey.self) { value in
                print("scroll position:", value)
                scrollPosition = value
            }
        }
        .padding(.horizontal, 16)
    }
}

struct ContentView: View {
    var body: some View {
        SidebarView()
    }
}