SwiftUI ForEach 数组索引不呈现

Question

我有一个简单的看法:

struct SomeView: View {
  @ObservedObject var viewModel: ViewModel()
  var body: some View {
    GeometryReader { fullView in
      ScrollView {
        VStack(spacing: 40) {
          ForEach(self.viewModel.list) { item in
            Text(item.name)
          }
        }
      }
    }
  }
}

这是有效的。但我需要使用索引。我尝试更改我的 ForEach 循环:

ForEach(self.viewModel.list.indices) { index in
  Text(self.viewModel.list[index].name)
}

但是这次 ForEach 没有渲染任何东西。但是在控制台上写着:

ForEach<Range<Int>, Int, ModifiedContent<ModifiedContent<GeometryReader<ModifiedContent<ModifiedContent<ModifiedContent<...>, _FrameLayout>, _TransactionModifier>> count (10) != its initial count (0). `ForEach(_:content:)` should only be used for *constant* data. Instead conform data to `Identifiable` or use `ForEach(_:id:content:)` and provide an explicit `id`!

我的模型是Identifiable

Answer 1

你可以同时拥有两者，如下所示

struct SomeView: View {
  @ObservedObject var viewModel: ViewModel()
  var body: some View {
    GeometryReader { fullView in
      ScrollView {
        VStack(spacing: 40) {
          ForEach(Array(self.viewModel.list.enumerated()), id: \.1) { index, item in
            Text(item.name)
            // ... use index here as needed
          }
        }
      }
    }
  }
}