Pub/Sub Property Sample #swift #combine

PublishedData.swift

// The list of drinks consumed.
    // Because this is @Published property,
    // Combine notifies any observers when a change occurs.
    @Published public var currentDrinks = [Drink]()

// A sink that is also called whenever the currentDrinks array changes.
    var updateSink: AnyCancellable!
    

// Add a subscriber to currentDrinks that responds whenever currentDrinks changes.
        updateSink = $currentDrinks.sink { [unowned self] _ in
            
            // Update any complications on active watch faces.
            let server = CLKComplicationServer.sharedInstance()
            for complication in server.activeComplications ?? [] {
                server.reloadTimeline(for: complication)
            }
            
            // Begin saving the data.
            self.save()
        }



    // The deinitializer for the model object.
    deinit {
        // Cancel the observer.
        updateSink.cancel()
    }