Hello world widget

import SwiftUI
import WidgetKit

struct WaterAppTimelineProvider: TimelineProvider {

  func placeholder(in context: Self.Context) -> WaterAppWidgetEntry {
    return .previewData
  }

  func getSnapshot(in context: Self.Context, completion: @escaping (WaterAppWidgetEntry) -> Void) {
    completion(WaterAppWidgetEntry.previewData)
  }

  func getTimeline(in context: Context, completion: @escaping (Timeline<WaterAppWidgetEntry>) -> Void) {
    let entry: WaterAppWidgetEntry = .init(
      date: Date(),
      text: "Hello, widget again")
    let timeline: Timeline<WaterAppWidgetEntry> = .init(
      entries: [entry],
      policy: .never)
    completion(timeline)
  }
}

struct WaterAppWidgetEntry: TimelineEntry {
  let date: Date
  let text: String

  static let previewData = WaterAppWidgetEntry(
    date: Date(),
    text: "Widget, hello world!")
}

struct WaterAppWidgetEntryView: View {
  let entry: WaterAppWidgetEntry

  var body: some View {
    ZStack {
      Color("BackgroundColor")
      Text(entry.text)
        .padding()
    }
  }
}

@main
struct WaterAppWidget: Widget {
  let kind = "WaterAppWidget"

  var body: some WidgetConfiguration {
    StaticConfiguration(
      kind: kind,
      provider: WaterAppTimelineProvider()) { entry in
      WaterAppWidgetEntryView(entry: entry)
    }
    .configurationDisplayName("your_water_results")
    .description("your_water_results_description")
    .supportedFamilies([.systemSmall, .systemMedium])
  }
}

struct WaterAppWidget_Previews: PreviewProvider {
  static var previews: some View {
    WaterAppWidgetEntryView(entry: .previewData)
      .previewContext(WidgetPreviewContext(family: .systemSmall))
    WaterAppWidgetEntryView(entry: .previewData)
      .previewContext(WidgetPreviewContext(family: .systemMedium))
    WaterAppWidgetEntryView(entry: .previewData)
      .previewContext(WidgetPreviewContext(family: .systemSmall))
      .redacted(reason: .placeholder)
    WaterAppWidgetEntryView(entry: .previewData)
      .previewContext(WidgetPreviewContext(family: .systemMedium))
      .environment(\.colorScheme, .dark)
  }
}