在 WidgetKit 中每分钟更新时间文本标签

是否可以在小部件中创建显示当前时间并实时更新的文本标签？

尝试创建时钟小部件，但小部件每 5 分钟仅更新 1 次。

• 创建时间表没有帮助
• “使小部件保持最新”不适用于当前时间，仅适用于计时器等。

一个可能的解决方案是使用time日期样式：

/// A style displaying only the time component for a date.
///
///     Text(event.startDate, style: .time)
///
/// Example output:
///     11:23PM
public static let time: Text.DateStyle

1. 你需要一个简单的Entry with a Date财产：

struct SimpleEntry: TimelineEntry {
    let date: Date
}

2. 创建一个Entry每分钟直到下一个午夜:

struct SimpleProvider: TimelineProvider {
    ...

    func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
        var entries = [SimpleEntry]()
        let currentDate = Date()
        let midnight = Calendar.current.startOfDay(for: currentDate)
        let nextMidnight = Calendar.current.date(byAdding: .day, value: 1, to: midnight)!

        for offset in 0 ..< 60 * 24 {
            let entryDate = Calendar.current.date(byAdding: .minute, value: offset, to: midnight)!
            entries.append(SimpleEntry(date: entryDate))
        }

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

3. 使用显示日期time style:

struct SimpleWidgetEntryView: View {
    var entry: SimpleProvider.Entry

    var body: some View {
        Text(entry.date, style: .time)
    }
}

如果您想自定义日期格式，您可以使用自己的DateFormatter:

struct SimpleWidgetEntryView: View {
    var entry: SimpleProvider.Entry
    
    static let dateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.dateFormat = "HH:mm"
        return formatter
    }()

    var body: some View {
        Text("\(entry.date, formatter: Self.dateFormatter)")
    }
}

_{Here is a GitHub repository https://github.com/pawello2222/WidgetExamples#clock-widget with different Widget examples including the Clock Widget.}