设置Widget的TimelineProvider刷新间隔

Question

现在我的 Widget 每秒发出大约 1 个请求。我想在1小时内将其更改为1个请求。

我在 let timeline = ... 的行上遇到了一些错误，比如 Value of optional type 'Date?' must be unwrapped to a value of type 'Date' 等等。

任何可能出错的建议：

struct Provider: IntentTimelineProvider {
    let networkManager = NetworkManager()
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), configuration: ConfigurationIntent(), clubname: networkManager.clubName)
    }
    
    func getSnapshot(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(), configuration: configuration, clubname: networkManager.clubName)
        completion(entry)
    }
    
    func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        var entries: [SimpleEntry] = []
        
        // Generate a timeline consisting of five entries an hour apart, starting from the current date.
        let currentDate = Date()
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            let entry = SimpleEntry(date: entryDate, configuration: configuration, clubname: networkManager.clubName)
            entries.append(entry)
        }
        
        //wie oft geupdatet werden soll
        
        let nextUpdate = Calendar.current.date(byAdding: .hour, value: 1, to: Date())
        
        let timeline = Timeline(entries: entries, policy: .after(nextUpdate))
        completion(timeline)
    }
}

Answer 1

您不应该依赖 TimelineReloadPolicy - 它指定刷新时间轴的最早日期，不保证它会在该特定时间重新加载.

根据我的观察，Widget 更有可能使用 atEnd 策略重新加载时间线。

A policy that specifies that WidgetKit requests a new timeline after the last date in a timeline passes.

这是一个可能的解决方案：

func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
    print("getTimeline")
    let entries = [
        SimpleEntry(date: Date()),
        SimpleEntry(date: Calendar.current.date(byAdding: .minute, value: 1, to: Date())!),
    ]

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

请注意，最后一个条目可能会也可能不会被使用。如果在第二个条目的日期之后立即刷新时间线，则不会显示第二个条目。但是，有时时间线可能会延迟重新加载 - 然后第二个条目将可见（直到刷新时间线）。

设置Widget的TimelineProvider刷新间隔

Setting the TimelineProvider refresh interval for Widget

swift

swiftui

widgetkit