iOS app extensions - widgets and share

import WidgetKit
import SwiftUI

struct SimpleEntry: TimelineEntry {
    let date: Date
    let count: Int
    let message: String
}

struct Provider: TimelineProvider {
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), count: 0, message: "Placeholder")
    }

    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> Void) {
        let entry = SimpleEntry(date: Date(), count: 42, message: "Snapshot")
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> Void) {
        var entries: [SimpleEntry] = []
        let currentDate = Date()

        // Generate timeline entries for next 5 hours
        for hourOffset in 0..<5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = SimpleEntry(
                date: entryDate,
                count: hourOffset * 10,
                message: "Update \(hourOffset)"
            )
            entries.append(entry)
        }

        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct SimpleWidgetEntryView: View {
    var entry: Provider.Entry
    @Environment(\.widgetFamily) var family

    var body: some View {
        switch family {
        case .systemSmall:
            SmallWidgetView(entry: entry)
        case .systemMedium:
            MediumWidgetView(entry: entry)
        case .systemLarge:
            LargeWidgetView(entry: entry)
        default:
            SmallWidgetView(entry: entry)
        }
    }
}

struct SmallWidgetView: View {
    let entry: SimpleEntry

    var body: some View {
        VStack {
            Text(entry.message)
                .font(.headline)
            Text("\(entry.count)")
                .font(.largeTitle)
                .fontWeight(.bold)
        }
        .padding()
    }
}

struct MediumWidgetView: View {
    let entry: SimpleEntry

    var body: some View {
        HStack {
            VStack(alignment: .leading) {
                Text(entry.message)
                    .font(.headline)
                Text(entry.date, style: .time)
                    .font(.caption)
            }
            Spacer()
            Text("\(entry.count)")
                .font(.system(size: 40, weight: .bold))
        }
        .padding()
    }
}

struct LargeWidgetView: View {
    let entry: SimpleEntry

    var body: some View {
        VStack(alignment: .leading, spacing: 16) {
            Text(entry.message)
                .font(.title)
                .fontWeight(.bold)

            Text("Count: \(entry.count)")
                .font(.title2)

            Text(entry.date, style: .time)
                .font(.caption)
                .foregroundColor(.secondary)

            Spacer()
        }
        .padding()
    }
}

@main
struct SimpleWidget: Widget {
    let kind: String = "SimpleWidget"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
            SimpleWidgetEntryView(entry: entry)
        }
        .configurationDisplayName("My Widget")
        .description("This displays useful information.")
        .supportedFamilies([.systemSmall, .systemMedium, .systemLarge])
    }
}