SwiftUIを使ったTODOアプリのサンプル
SwiftUIを使ったTODOアプリのサンプルコードです。 InputView で入力した TODOは ContentView に表示されます。
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| import SwiftUI | |
| struct ContentView: View, InputViewDelegate { | |
| @State var todos: [String] = [] | |
| var body: some View { | |
| NavigationView { | |
| ZStack(alignment: .bottomTrailing) { | |
| List { | |
| ForEach(todos, id: \.self) { user in | |
| Text(user) | |
| } | |
| .onDelete(perform: delete) | |
| } | |
| NavigationLink(destination: InputView(delegate: self, text: "")) { | |
| Text("Add") | |
| .foregroundColor(Color.white) | |
| .font(Font.system(size: 20)) | |
| } | |
| .frame(width: 60, height: 60) | |
| .background(Color.orange) | |
| .cornerRadius(30) | |
| .padding() | |
| } | |
| .onAppear { | |
| if let todos = UserDefaults.standard.array(forKey: "TODO") as? [String] { | |
| self.todos = todos | |
| } | |
| } | |
| .navigationTitle("TODO") | |
| .navigationBarItems(trailing: EditButton()) | |
| } | |
| } | |
| func delete(at offsets: IndexSet) { | |
| todos.remove(atOffsets: offsets) | |
| print(todos) | |
| UserDefaults.standard.setValue(todos, forKey: "TODO") | |
| } | |
| func addTodo(text: String) { | |
| todos.append(text) | |
| UserDefaults.standard.setValue(todos, forKey: "TODO") | |
| } | |
| } | |
| protocol InputViewDelegate { | |
| func addTodo(text: String) | |
| } | |
| struct InputView: View { | |
| @Environment(\.presentationMode) var presentation | |
| let delegate: InputViewDelegate | |
| @State var text: String | |
| var body: some View { | |
| VStack(spacing: 16) { | |
| TextField("Input Your TODO", text: $text) | |
| .textFieldStyle(RoundedBorderTextFieldStyle()) | |
| Button("Add") { | |
| delegate.addTodo(text: text) | |
| presentation.wrappedValue.dismiss() | |
| } | |
| } | |
| .padding() | |
| } | |
| } | |
| struct ContentView_Previews: PreviewProvider { | |
| static var previews: some View { | |
| ContentView() | |
| } | |
| } | |