如何在SwiftUI中更改模式或工作表的大小？

struct CustomSheetSizeModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .frame(width: UIScreen.main.bounds.width * 0.8, height: UIScreen.main.bounds.height * 0.6)
    }
}

struct DetailView: View {
    @Environment(\.presentationMode) var presentationMode
    
    var body: some View {
        VStack {
            Text("Detail View")
            Button("Dismiss") {
                presentationMode.wrappedValue.dismiss()
            }
        }
        .modifier(CustomSheetSizeModifier())
    }
}

struct ContentView: View {
    @State private var showDetail = false
    
    var body: some View {
        Button("Show Detail") {
            showDetail = true
        }
        .sheet(isPresented: $showDetail) {
            DetailView()
        }
    }
}