How to manually set selection on SwiftUI List? - swift

Question

Same question here: How to stop showing Detail view when item in Master view deleted?.
Now I am developing a macOS app, which there's a List and a Detail view, also there's a selection binding the list row, which use to delete the row. But when I delete the row, the detail view didn't disappears.
Also there's an ADD button, when user click it, a new row will append to the last positon. But the selection always stay on the last postion, so I want to change to the new created one.
Here's the code:
struct DetailView: View {
var item: String
var body: some View {
Text("Detail of \(item)")
}
}
struct ContentView: View {
#State private var items = ["Item 1", "Item 2", "Item 3"]
#State private var selection: String?
var body: some View {
NavigationView {
VStack {
List {
ForEach(items, id: \.self, selection: $selection) { item in
NavigationLink(destination: DetailView(item: item)) {
Text(item)
}
}
.onDelete(perform: delete)
}
Button {
let newCreatedItem = add()
selection = newCreatedItem // not work!
} label: {
Image(systemName: "add")
}
Button {
if let item = selection {
delete(item: item) // some other function
}
} label: {
Image(systemName: "minus.rectangle.fill")
}
.disabled(selection == nil)
}
Text("Please select an item.")
}
}
func delete(at offsets: IndexSet) {
items.remove(atOffsets: offsets)
}
}
I tried to set selection = nil on deletion, but it doesn't work.
Also I want to set selection = newCreatedItem, it doesn't work.