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| extension List { | |
| func emptyListPlaceholder(_ items: [Any], _ placeholder: AnyView) -> some View { | |
| modifier(EmptyDataModifier(items: items, placeholder: placeholder)) | |
| } | |
| } | |
| struct ContentView: View { | |
| @State var countries: [Country] = [] // Data source |
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| struct ContentView: View { | |
| @State var countries: [Country] = [] // Data source | |
| var body: some View { | |
| List(countries) { country in | |
| Text(country.name) | |
| .font(.title) | |
| } | |
| .modifier(EmptyDataModifier( |
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| struct EmptyDataModifier<Placeholder: View>: ViewModifier { | |
| let items: [Any] | |
| let placeholder: Placeholder | |
| @ViewBuilder | |
| func body(content: Content) -> some View { | |
| if !items.isEmpty { | |
| content | |
| } else { |
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| struct ContentView: View { | |
| @State var countries: [Country] = [] // Data source | |
| var body: some View { | |
| EmptyList(countries, // Data items | |
| listRowView: { country in // List row view | |
| Text(country.name) | |
| .font(.title) | |
| }, placeholderView: { |
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| struct EmptyList<Items: RandomAccessCollection, ListRowView: View, PlaceholderView: View>: View where Items.Element: Identifiable { | |
| private let items: Items | |
| private let listRowView: (Items.Element) -> ListRowView | |
| private let placeholderView: () -> PlaceholderView | |
| /// - Parameters: | |
| /// - items: Source data for List. Item must implement Identifiable protocol | |
| /// - listRowView: View displayed for each source Item | |
| /// - placeholderView: Placeholder. View displayed when the items collection isEmpty |
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| struct ContentView: View { | |
| @State var countries: [Country] = [] // Data source | |
| var body: some View { | |
| if countries.isEmpty { | |
| Text("No Countries") // Placeholder | |
| .font(.largeTitle) | |
| } else { | |
| List(countries) { country in // List countires |
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| struct Country: Identifiable { | |
| let id = UUID() | |
| let name: String | |
| } |
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| class SceneDelegate: UIResponder, UIWindowSceneDelegate { | |
| var window: UIWindow? | |
| func scene(_ scene: UIScene, | |
| willConnectTo session: UISceneSession, | |
| options connectionOptions: UIScene.ConnectionOptions) { | |
| // Get UIWindowScene | |
| guard let windowScene = (scene as? UIWindowScene) else { | |
| return |
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| @UIApplicationMain | |
| class AppDelegate: UIResponder, UIApplicationDelegate { | |
| var window: UIWindow? | |
| func application(_ application: UIApplication, | |
| didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { | |
| // Create a new window property | |
| self.window = UIWindow(frame: UIScreen.main.bounds) | |