iOS-Widget-Development-Kit

1struct LaunchEntry: TimelineEntry {
2    let date: Date
3}
4 
5struct LaunchProvider: TimelineProvider {
6    func placeholder(in context: Context) -> LaunchEntry {
7        LaunchEntry(date: .now)
8    }
9 
10    func getSnapshot(in context: Context, completion: @escaping (LaunchEntry) -> Void) {
11        completion(LaunchEntry(date: .now))
12    }
13 
14    func getTimeline(in context: Context, completion: @escaping (Timeline<LaunchEntry>) -> Void) {
15        // One entry per hour for the next six hours, then WidgetKit asks again.
16        let entries = TimelineSchedule.dates(from: .now, every: 60 * 60, count: 6).map(LaunchEntry.init)
17        completion(Timeline(entries: entries, policy: .atEnd))
18    }
19}
20 
21struct LaunchCountdownWidget: Widget {
22    let launchDay = DateComponents(calendar: .current, year: 2027, month: 1, day: 1).date ?? .now
23 
24    var body: some WidgetConfiguration {
25        StaticConfiguration(kind: "launch", provider: LaunchProvider()) { entry in
26            CountdownWidget(title: "Launch", targetDate: launchDay, referenceDate: entry.date)
27        }
28        .configurationDisplayName("Countdown")
29        .supportedFamilies([.systemSmall])
30    }
31}