将RoundedRectangle的宽度从0设置为width onAppear？

struct ContentView: View {
    @State private var rectangleWidth: CGFloat = 0
    
    var body: some View {
        RoundedRectangle(cornerRadius: 10)
            .frame(width: rectangleWidth, height: 100)
            .onAppear {
                withAnimation(.easeInOut(duration: 1)) {
                    rectangleWidth = 200
                }
            }
    }
}