使GeometryReader适合抽屉内容

import SwiftUI

struct ContentView: View {
    var body: some View {
        GeometryReader { geometry in
            HStack(spacing: 0) {
                // 抽屉侧边栏
                SidebarView()
                    .frame(width: geometry.size.width * 0.33)
                    .background(Color.gray.opacity(0.2))
                
                // 主要内容区域
                MainContentView()
                    .frame(maxWidth: .infinity)
            }
            .edgesIgnoringSafeArea(.all)
        }
    }
}

struct SidebarView: View {
    var body: some View {
        VStack {
            Text("侧边栏")
                .font(.headline)
                .padding()
            // 其他侧边栏内容...
        }
    }
}

struct MainContentView: View {
    var body: some View {
        VStack {
            Text("主要内容区域")
                .font(.largeTitle)
                .padding()
            // 其他主要内容...
        }
    }
}

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