我正在为 ios 14 Home Widget 开发一个应用程序,在显示当前时间(数字时钟)时遇到一个问题,即该小部件没有每秒更新。众所周知,苹果不允许每秒触发时间线,有没有其他方法可以实时更新显示当前时间?
我尝试了这些方法,但没有按预期工作
class NetworkManager: ObservableObject {
@Published var dateIs = Date()
init() {
startTimer() // fetch data must be called at least once
}
private func startTimer() {
let t = RepeatingTimer(timeInterval: 3)
t.eventHandler = {
DispatchQueue.main.async() {
// your UI update code
print("Timer Fired")
self.dateIs = Date()
WidgetCenter.shared.reloadAllTimelines() // reload timelines
}
if(false){ //I know this makes no sense, but it works. Go figure...
t.suspend()
}
}
t.resume()
}
}
struct Provider: TimelineProvider {
init() {
networkManager = NetworkManager()
}
@AppStorage("storedData", store: UserDefaults(suiteName: "group.com.name"))
var data: Data = Data()
func placeholder(in context: Context) -> WidgetEntry {
let entry = WidgetEntry(date: Date(), storedData: storedData[0], dateIs: networkManager.dateIs)
return entry
}
func getSnapshot(in context: Context, completion: @escaping (WidgetEntry) -> Void) {
guard let storedData: WidgetTemplate = try? JSONDecoder().decode(WidgetTemplate.self, from: data) else { return }
let entry = WidgetEntry(date: Date(), storedData: storedData, dateIs: networkManager.dateIs)
completion(entry)
}
func getTimeline(in context: Context, completion: @escaping (Timeline<WidgetEntry>) -> Void) {
guard let storedData: WidgetTemplate = try? JSONDecoder().decode(WidgetTemplate.self, from: data) else { return }
let entry = WidgetEntry(date: Date(), storedData: storedData, dateIs: networkManager.dateIs)
let currentDate = Date()
let refreshDate = Calendar.current.date(byAdding: .minute, value: 5, to: currentDate)!
let timeline = Timeline(entries: [entry], policy: .after(refreshDate))
completion(timeline)
}
}
您无权刷新 Widget每一秒。这是苹果的限制。
你能做的最好的就是显示日期seconds使用timer
日期样式:
/// A style displaying a date as timer counting from now.
///
/// Text(event.startDate, style: .timer)
///
/// Example output:
/// 2:32
/// 36:59:01
public static let timer: Text.DateStyle
- 你需要一个简单的
Entry
with a Date
财产:
struct SimpleEntry: TimelineEntry {
let date: Date
}
- 通过midnight给定日期的日期
Entry
并在之后刷新时间线下一个午夜:
struct SimpleProvider: TimelineProvider {
...
func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
let midnight = Calendar.current.startOfDay(for: Date())
let nextMidnight = Calendar.current.date(byAdding: .day, value: 1, to: midnight)!
let entries = [SimpleEntry(date: midnight)]
let timeline = Timeline(entries: entries, policy: .after(nextMidnight))
completion(timeline)
}
}
- 使用显示日期
timer
style:
struct SimpleWidgetEntryView: View {
var entry: SimpleProvider.Entry
var body: some View {
Text(entry.date, style: .timer)
}
}
请注意,当您刷新时间线时(通过指定TimelineReloadPolicy
或通过致电WidgetCenter
)你设置earliestWidget 刷新的时间。
不保证刷新在那个特定时间.
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