適当SearchView.swift

struct SearchView: View {
    @State var text: String
    @FocusState var focused: Bool
    @Async<[Item]> var async

    var body: some View {
        VStack {
            TextField("Placeholder", text: $text)
                .focused($focused)
                .onSubmit {
                    async(fetch)
                }

            if text.isEmpty {
                Text("Do Input")
            } else if focused {
                Text("Do submit")
            } else {
                // 違うViewに切り出しても良いかも
                switch async.state {
                case .success(let items):
                    if items.isEmpty {
                        Text("No Result")
                    } else {
                        List {
                            ForEach(items) { item in
                                SearchedView(item)
                            }
                        }
                    }
                case .failure(let error):
                    ErrorPage(error: error)
                case .loading:
                    ProgressView()
                }
            }
        }
    }

    func fetch() async throws -> [Item] {
        try await apiClient.call("search", args: ["query": text])
    }
}