ios - SwiftUI中的.transition修饰符

Question

当我按下按钮时，我希望第二个矩形(绿色)在第一个矩形(红色)上方上下移动

struct ContentView: View {

    @State var visible = false

    var body: some View {
        return HStack {
            Button("button") {
                self.visible.toggle()
            }
            ZStack {

                Rectangle()
                    .frame(width: 100, height: 100)
                    .foregroundColor(Color.red)

                if visible {   
                    Rectangle()
                        .frame(width: 100, height: 100)
                        .foregroundColor(Color.green)
                        .transition(.move(edge: .bottom))
                        .animation(.linear(duration: 2))
                }

            }
        }
    }
}

当绿色矩形出现时，它会出现在红色矩形上方，但是当它消失时，移动的过渡会出现在红色矩形后面。

Answer 1

只需添加zIndex:

struct ContentView: View {

    @State var visible = false

    var body: some View {
        return HStack {
            Button("button") {
                self.visible.toggle()
            }
            ZStack {

                Rectangle()
                    .frame(width: 100, height: 100)
                    .foregroundColor(Color.red)

                if visible {   
                    Rectangle()
                        .frame(width: 100, height: 100)
                        .foregroundColor(Color.green)
                        .transition(.move(edge: .bottom))
                        .animation(.linear(duration: 2))
                        .zIndex(1)
                }

            }
        }
    }
}