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
最佳答案
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
}
}
}
}
}
}
关于SwiftUI ForEach 数组索引不呈现,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62827401/