当用户在SwiftUi中打开应用程序时，如何让对象自动旋转？

import SwiftUI

struct ContentView: View {
    @State private var rotationAngle = Angle(degrees: 0)
    
    var body: some View {
        Text("Hello, World!")
            .rotationEffect(rotationAngle)
            .animation(.linear(duration: 2.0))
            .onAppear {
                withAnimation {
                    rotationAngle = Angle(degrees: 360)
                }
            }
    }
}