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SwiftUI hidden tip - _VariadicViewを使ってtagをindexに応じて割り当てる

2023/05/31に公開

fileprivate struct TagAssignment<Content: View>: View {

  let tree: _VariadicView.Tree<VariadicViewProxy, Content>

  init(@ViewBuilder content: () -> Content) {
    self.tree = _VariadicView.Tree(VariadicViewProxy(), content: content)
  }

  var body: some View {
    tree
  }

  struct VariadicViewProxy: _VariadicView_MultiViewRoot {
    @ViewBuilder
    func body(children: _VariadicView.Children) -> some View {
      ForEach(children.indexed(), id: \.element.id) { a in
        a.element
          .tag(a.index)
      }
    }
  }

}

    TabView(selection: $currentIndex) {
      TagAssignment {
	Self.makeCarouselItem()
	Self.makeCarouselItem()
	Self.makeCarouselItem()
      }
    }
      .tabViewStyle(PageTabViewStyle(indexDisplayMode: .never))

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