iOS17 适配

extension View {
    func widgetBackground(_ backgroundView: some View) -> some View {
        // 如果是 iOS 17，则使用 containerBackground
        if #available(iOSApplicationExtension 17.0, *) {
            return containerBackground(for: .widget) {
                backgroundView
            }
        } else {
            return background(backgroundView)
        }
    }
}

struct MyWidgetEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        VStack {
            Spacer()
            HStack {
                Spacer()
                Text(entry.date, style: .time)
                Spacer()
            }
            Spacer()
        }
        .widgetBackground(backgroundView: Color.red)
    }
}

extension WidgetConfiguration {
    func disableContentMarginsIfNeeded() -> some WidgetConfiguration {
        if #available(iOSApplicationExtension 17.0, *) {
            return self.contentMarginsDisabled()
        } else {
            return self
        }
    }
}

struct MyWidget: Widget {
    let kind: String = "MyWidget" // 唯一标识

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
            MyWidgetEntryView(entry: entry)
        }
        .configurationDisplayName("这是小组件的名称")
        .description("这是小组件的描述.")
        .supportedFamilies([.systemSmall, .systemMedium, .systemLarge])
        .disableContentMarginsIfNeeded()
    }
}