SwiftUI ForEach数组索引未呈现

Question

我有一个简单的视图：

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。但我需要索引。我试着改变我的ForEach循环：

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

但这一次ForEach没有渲染任何内容。但控制台上写着：

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`!

我的型号是Identifiable

Answer 1

你可以两者都有，就像下面的一样

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
}
}
}
}
}
}