List Focus

Example.swift

struct RootView: View {

    @State var items: [Int] = [0,1,2]

    @State var selected: Int?

    @State var detailView: Bool = false
        
    // 1. Create state
    @FocusState private var focussed: Bool

    var body: some View {
        VStack {
            if detailView {
                Button(action: {
                    detailView = false
                }, label: {
                    Text("Exit")
                })
            }
            else {
                List(items, id:\.self, selection: $selected) { index in
                    Text("\(index)")
                        .tag(index)
                }
                // 2. Apply modifier 
                .focused($focussed)
                .onAppear {
                    // 3. Set to true on appear 
                    focussed = true
                }
                Button(action: {
                    detailView = true
                }, label: {
                    Text("detail view")
                })
            }
        }
        .frame(width: 300, height: 420, alignment: .top)
        .onAppear {
            selected = 0
        }
        // Debug
        .overlay {
            Text(String(describing: focussed))
        }
    }
}