Swift 如何获得不同的插入和移除过渡动画

我可以为插入视图和删除视图指定不同的转换:

.transition(
    .asymmetric(
        insertion: .move(edge: .leading)
        removal: .move(edge: .trailing)
    )
)

这很好用.然而，我希望它这么容易在快速，当它被添加，并缓解缓慢时删除.尽管编译得很好，但下面的代码似乎没有做任何事情.

.transition(
    .asymmetric(
        insertion: .move(edge: .leading)
            .animation(.easeIn(duration: 2)),
        removal: .move(edge: .trailing)
            .animation(.easeOut(duration: 5))
    )
)

我是否误解了.animation作为过渡修饰语的用法？

演示代码:

struct TestView: View {
    @State private var showDetails = false

    var body: some View {
        VStack {
            Button("Press to show details") {
                withAnimation {
                    showDetails.toggle()
                }
            }

            if showDetails {
                Text("Details go here.")
                    .background(Color.blue)
                    .transition(
                        .asymmetric(
                            insertion: .move(edge: .leading)
                                .animation(.easeIn(duration: 5)),
                            removal: .move(edge: .trailing)
                                .animation(.easeOut(duration: 5))
                        )
                    )
            }
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}