我正在尝试制作一个基本的SwiftUI列表,其中每个新的列表项都显示在列表顶部。为此,在传递给ForEach循环的数组
viewModel.itemList
后面添加了.reversed()。我还设置了.onDelete来处理列表项的删除。然而,当我删除一个项目(例如列表中的最后一个项目)时,它实际上会删除数组中的最后一个项目(即列表顶部的项目)。如何配置.onDelete以在反转数组时删除正确的项目?请看下面的代码,谢谢!struct ContentView: View {
@StateObject var viewModel = ToDoListViewModel()
@State private var listItemName = ""
var body: some View {
NavigationView {
VStack(alignment: .leading) {
List {
ForEach(viewModel.itemList.reversed()) { item in
Text(item.listItem)
}.onDelete { index in
self.viewModel.itemList.remove(atOffsets: index)
}
}
HStack {
TextField("Enter List Item", text: $listItemName)
Button(action: {
viewModel.addToList(ToDoModel(listItem: listItemName))
listItemName = ""
}) {
Image(systemName: "plus")
.font(.largeTitle)
.frame(width: 75, height: 75)
.foregroundColor(Color.white)
.background(Color.blue)
.clipShape(Circle())
}
}.frame(minWidth: 100, idealWidth: 150, maxWidth: 500, minHeight: 30, idealHeight: 40, maxHeight: 50, alignment: .leading)
.padding(.leading, 16)
.padding(.trailing, 16)
}.navigationBarTitle("To Do List", displayMode: .inline)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
模型
struct ToDoModel: Identifiable, Codable {
var id = UUID()
var listItem: String = ""
}
视图模型
class ToDoListViewModel: ObservableObject {
@Published var itemList = [ToDoModel]()
func addToList( _ item: ToDoModel) {
itemList.append(item)
}
}