iOS14-WidgetKit-TimelineProvider.swift

struct JokeProvider: TimelineProvider {
    public func snapshot(with context: Context, completion: @escaping (JokesEntry) -> ()) {
        let entry = JokesEntry(date: Date(), joke: "...")
        completion(entry)
    }

    public func timeline(with context: Context,
                         completion: @escaping (Timeline<Entry>) -> ()) {
        
        DataFetcher.shared.getJokes{
            response in

            let date = Date()
            let calendar = Calendar.current
                        
            let entries = response?.enumerated().map { offset, currentJoke in
                JokesEntry(date: calendar.date(byAdding: .second, value: offset*2, to: date)!, joke: currentJoke.joke ?? "...")
            }

            let timeLine = Timeline(entries: entries ?? [], policy: .atEnd)
            
            completion(timeLine)
            
        }
    }
}