如何使用GeometryReader在LazyVGrid中拖动视图？

import SwiftUI

struct ContentView: View {
    let columns = [
        GridItem(.flexible()),
        GridItem(.flexible())
    ]
    
    var body: some View {
        ScrollView {
            LazyVGrid(columns: columns, spacing: 20) {
                ForEach(0..<10) { index in
                    Text("Item \(index)")
                        .frame(width: 150, height: 150)
                        .background(Color.blue)
                        .cornerRadius(10)
                }
            }
            .padding()
            .overlay(
                GeometryReader { proxy in
                    Color.clear
                        .preference(key: ScrollOffsetPreferenceKey.self, value: proxy.frame(in: .named("scroll")).origin.y)
                }
            )
        }
        .coordinateSpace(name: "scroll")
        .onPreferenceChange(ScrollOffsetPreferenceKey.self) { value in
            // 处理滚动偏移量的变化
            print("Scroll offset: \(value)")
        }
    }
}

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

.overlay(
    GeometryReader { proxy in
        Color.clear
            .preference(key: ScrollOffsetPreferenceKey.self, value: proxy.frame(in: .named("scroll")).origin.y)
    }
)

.coordinateSpace(name: "scroll")

.onPreferenceChange(ScrollOffsetPreferenceKey.self) { value in
    // 处理滚动偏移量的变化
    print("Scroll offset: \(value)")
}