如何在SwiftUI和iOS 14中更改单元格背景颜色？

import SwiftUI

struct ContentView: View {
    let colors: [Color] = [.red, .green, .blue, .yellow]
    
    var body: some View {
        List {
            ForEach(0..<colors.count) { index in
                Text("Row \(index)")
                    .frame(height: 50)
                    .background(colors[index])
            }
        }
        .listStyle(InsetGroupedListStyle())
        .background(Color.gray) // 设置整个列表的背景颜色
    }
}

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