SwiftUI: Change a view's transition dynamically after the view is created

Question

I want to change a view's transition dynamically after the view is created. I toggle a State variable isTransition1 by clicking a button to switch between transition1 and transition2 as the below. However, it doesn't work as intended if one of these transitions is opacity. The view to be removed immediately after changing transition always keeps its original transition. Surprisingly, if I change transition2 to slide, it will work without problem. The view to be removed will use the new transition. Is there any way to make opacity work here?

let transition1 = AnyTransition.asymmetric(insertion: .move(edge: .trailing),
                                           removal: .move(edge: .leading))

let transition2 = AnyTransition.opacity

struct Wrapper1<Content: View>: View {
  let content: Content

  var body: some View {
    content
  }
}

struct Wrapper2<Content: View>: View {
  let content: Content

  var body: some View {
    content
  }
}

struct TextView: View {
  let count: Int
  let color: Color

  var body: some View {
    ZStack {
      color
        .edgesIgnoringSafeArea(.all)
        .frame(maxWidth: UIScreen.main.bounds.width,
               maxHeight: UIScreen.main.bounds.height)

      Text("Count: \(count)")
        .font(.title)
        .offset(y: -200)
    }
  }
}

struct ContentView: View {
  @State private var count = 0
  @State private var isTransition1 = false

  var body: some View {
    ZStack {
      if count % 2 == 0 {
        Wrapper1(content: TextView(count: count, color: Color.green)
          .transition(isTransition1 ? transition1 : transition2))
        } else {
          Wrapper2(content: TextView(count: count, color: Color.red)
            .transition(isTransition1 ? transition1 : transition2))
        }

      HStack(spacing: 100) {
        Button(action: {
          self.isTransition1.toggle()
        }) {
          Text("Toggle Transition").font(.title)
        }

        Button(action: {
          withAnimation(.linear(duration: 2)) {
            self.count += 1
          }
        }) {
          Text("Increase").font(.title)
        }
      }
    }
  }
}

Answer 1

Not sure if I correctly understood what effect you tried to achieve, but try to reset view hierarchy (at least this definitely resets transitions, so they don't affect each other):

  var body: some View {
    ZStack {
      if count % 2 == 0 {
        Wrapper1(content: TextView(count: count, color: Color.green)
          .transition(isTransition1 ? transition1 : transition2))
        } else {
          Wrapper2(content: TextView(count: count, color: Color.red)
            .transition(isTransition1 ? transition1 : transition2))
        }

      HStack(spacing: 100) {
        Button(action: {
          self.isTransition1.toggle()
        }) {
          Text("Toggle Transition").font(.title)
        }

        Button(action: {
          withAnimation(.linear(duration: 2)) {
            self.count += 1
          }
        }) {
          Text("Increase").font(.title)
        }
      }
    }.id(isTransition1)     // << here !!
  }