iOS SwiftUI:阻止可调整大小的()动画

struct ContentView: View {
    @State private var isExpanded = false
    
    var body: some View {
        VStack {
            Button(action: {
                withAnimation {
                    self.isExpanded.toggle()
                }
            }) {
                Text("Toggle Size")
                    .padding()
                    .background(Color.blue)
                    .foregroundColor(.white)
                    .cornerRadius(10)
            }
            
            if isExpanded {
                Rectangle()
                    .frame(width: 200, height: 200)
                    .foregroundColor(.red)
                    .animation(nil) // 阻止可调整大小的动画
            } else {
                Rectangle()
                    .frame(width: 100, height: 100)
                    .foregroundColor(.green)
                    .animation(nil) // 阻止可调整大小的动画
            }
        }
    }
}