SwiftUI如何获得自定义幻灯片转场的视图大小？

struct CustomTransitionView: View {
    @State private var isPresented = false
    
    var body: some View {
        Button("Present") {
            isPresented.toggle()
        }
        .sheet(isPresented: $isPresented) {
            GeometryReader { geometry in
                VStack {
                    Text("Custom Transition")
                        .font(.largeTitle)
                        .padding()
                    
                    // Your custom content here
                    
                }
                .frame(width: geometry.size.width, height: geometry.size.height)
            }
        }
    }
}