Ios 帧过渡动画有条件地工作

我试图使包含字符串数组的子视图在切换父视图上的按钮时随着动画来回移动.

struct ParentView: View {
  @State isToggle: Bool

  var body: some View {
     
     ChildView(isToggle: isToggle)
         .onTabGesture {
            withAnimation {
               isToggle.toggle()
            }
         }
  }
}


struct ChildView: View {
 
  let values = [one, two, three, four]
  
  var isToggle: Bool

  var body: some View {
    
    HStack {
       ForEach(values) { value in
            Text("\(value)")
                     .frame(width: UIScreen.main.bounds.width / 3)
       }
   }
    .frame(width: UIScreen.main.bounds.width, alignment: isToggle ? .trailing : .leading)
}

我将代码(存储属性更改为viewmodel)更改如下.它按预期工作.

class ViewModel: ObservableObject {

  @Published var values = [one, two, three, four]

}

struct ParentView: View {
  @State isToggle: Bool

  var body: some View {
     
     ChildView(isToggle: isToggle)
         .onTabGesture {
            withAnimation {
               isToggle.toggle()
            }
         }
  }

}


struct ChildView: View {
 
  @EnvironmentObject private vm: ViewModel
  
  var isToggle: Bool

  var body: some View {
    
    HStack {
       ForEach(values) { vm.value in
            Text("\(value)")
                     .frame(width: UIScreen.main.bounds.width / 3)
       }
   }
    .frame(width: UIScreen.main.bounds.width, alignment: isToggle ? .trailing : .leading)
}

我认为切换状态只会在使用存储属性时重画视图.