为什么 SwiftUI 视图转换修饰符不起作用？

Question

I needed to add a view to my scene using a view transition. I was trying to use the modifier .transition(.opacity) but it just adds the view without any transition. I also tried the other transition types and they don't work. Since this is a really simple test project a don't see where's the issue. Here's a link to a video of my problem

import SwiftUI

struct Test: View {

    @State var show = false

    var body: some View {
        VStack {
            Button(action: {self.show.toggle()}) {
                Text("Button")
            }

            if show {
                Text("Test Text")
                    .transition(.move(edge: .top))
            }
        }
    }
}

struct Test_Previews: PreviewProvider {
    static var previews: some View {
        Test()
    }
}

Answer 1

You need to add animation for the transition

 if show {

                Text("Test Text").animation(.linear)
                .transition(.move(edge: .top))
        }