dependencies:

  flutter:

    sdk: flutter

  flutter_widgetkit: ^1.0.3 # Use the latest version

var textController = TextEditingController();  

@override

  Widget build(BuildContext context) {

    return Scaffold(

      body: Center(

        child: Column(

          mainAxisAlignment: MainAxisAlignment.center,

          children: [

            SizedBox(

              width: 250,

              child: TextField(

                controller: textController,

                decoration: InputDecoration(

                  hintText: "Enter widget text",

                ),

              ),

            ),

            const SizedBox(height: 10),

            ElevatedButton(

              onPressed: () {},

              child: const Text("Send to Widget"),

            ),

          ],

        ),

      ),

    );

  }

class WidgetData {

  final String text;

  WidgetData(this.text);

  WidgetData.fromJson(Map<String, dynamic> json) : text = json['text'];

  Map<String, dynamic> toJson() => {'text': text};

}

ElevatedButton(

  onPressed: () {

    WidgetKit.setItem(

        'widgetData',

        jsonEncode(WidgetData(textController.text)),

        'group.flutterioswidget');

    WidgetKit.reloadAllTimelines();

  },

  child: const Text("Push to Widget"),

),

struct WidgetData: Decodable, Hashable {

    let text: String

}

struct FlutterEntry: TimelineEntry {

    let date: Date

    let widgetData: WidgetData?

}

struct Provider: TimelineProvider {

    func placeholder(in context: Context) -> FlutterEntry {

        FlutterEntry(date: Date(), widgetData: WidgetData(text: "Flutter iOS widget!"))

    }

    func getSnapshot(in context: Context, completion: @escaping (FlutterEntry) -> ()) {

        let entry = FlutterEntry(date: Date(), widgetData: WidgetData(text: "Flutter iOS widget!"))

        completion(entry)

    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {

        let sharedDefaults = UserDefaults.init(suiteName: "group.flutterioswidget")

        let flutterData = try? JSONDecoder().decode(WidgetData.self, from: (sharedDefaults?

            .string(forKey: "widgetData")?.data(using: .utf8)) ?? Data())

        let entryDate = Calendar.current.date(byAdding: .hour, value: 24, to: Date())!

        let entry = FlutterEntry(date: entryDate, widgetData: flutterData)

        let timeline = Timeline(entries: [entry], policy: .atEnd)

        completion(timeline)

    }

}

struct FlutterIOSWidgetEntryView : View {

    var entry: Provider.Entry

    var body: some View {

        Text(entry.widgetData?.text ?? "Tap to set message.")

    }

}

struct FlutterIOSWidget: Widget {

    let kind: String = "FlutterIOSWidget"

    var body: some WidgetConfiguration {

        StaticConfiguration(kind: kind, provider: Provider()) { entry in

            FlutterIOSWidgetEntryView(entry: entry)

        }

        .configurationDisplayName("Flutter iOS Widget")

        .description("This is an example Flutter iOS widget.")

    }

}