TimelineAndPlaceholder.swift

public func timeline(with context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        
        // Generate a timeline consisting of one entry with reload policy after 1 min.
        let currentDate = Date()
        let nextUpdateDate = Calendar.current.date(byAdding: .minute,
                                                   value: 1,
                                                   to: currentDate)!
        let entry = WalletWidgetEntry(date: currentDate)
        let timeline = Timeline(entries: [entry], policy: .after(nextUpdateDate))
        completion(timeline)
    }
    
    public func placeholder(in context: Context) -> Entry {
        let entry = WalletWidgetEntry(date: Date())
        return entry
    }