I'm making a widget app that shows today's date and calendar.
I want the widget refresh every midnight, so I tried several methods.
But eventually I failed to figure out how to do it.
First try : give entries that update every midnight. But it doesn't update the widget every midnight exactly.
struct Provider: TimelineProvider {
	func getTimeline(in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
		var entries: [SomeEntry] = []
		let currentDate = Date()
		let currentEntry = SomeEntry(date: currentDate), content: content)
		entries.append(currentEntry)
		for offset in 1 ..< 5 {
			let day = Calendar.autoupdatingCurrent.date(byAdding: .day, value: offset, to: currentDate)!
			let midnight = Calendar.autoupdatingCurrent.startOfDay(for: day)
			let entry = SomeEntry(date: midnight, content: content)
			entries.append(entry)
		}
		completion(entries, .atEnd)
	}
}
Second try : Dynamic Dates
I tried to use dynamic dates which was described here (https://developer.apple.com/documentation/widgetkit/displaying-dynamic-dates)
But it's not customizable, so I think I can't use it when making calendar widget.
Third try : Local notification
I tried to use local notification to reload widget every midnight.
But I found in iOS, I can't use silent local notification.
Fourth try : Background Tasks
I tried background tasks, but it won't refresh widget if the app is terminated.
I know that other popular widget app's widget updates exact every midnight. Even if I manually change device time, they work.
I think there is a way that can alert widget extension when date changes.
Any idea how to do it??
hyoungbin
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