How to implement guide with fetching updated data using combine in swiftui after a background fetch
I'm working with an scenario where my SwiftUI view is not reflecting the updated data fetched via Combine after performing a background fetch. I’m using iOS 15 and Swift 5. When I initiate a background fetch, the data is being fetched correctly, but the UI doesn’t update as expected. Here's the relevant part of my code: ```swift import SwiftUI import Combine class DataFetcher: ObservableObject { @Published var data: [String] = [] private var cancellables = Set<AnyCancellable>() func fetchData() { // Simulate a network call with a delay DispatchQueue.global().asyncAfter(deadline: .now() + 2) { let newData = ["Item 1", "Item 2", "Item 3"] DispatchQueue.main.async { self.data = newData } } } } struct ContentView: View { @ObservedObject var dataFetcher = DataFetcher() var body: some View { List(dataFetcher.data, id: \.self) { item in Text(item) } .onAppear { dataFetcher.fetchData() } } } ``` I have tried calling `fetchData()` on `didFinishFetching` method of the background fetch, but it seems the UI is not updating unless I manually refresh the view. Here’s what I’ve implemented for the background fetch: ```swift func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) { dataFetcher.fetchData() // Attempt to fetch data during background fetch completionHandler(.newData) } ``` However, I get an unpredictable behavior where sometimes the data updates but doesn’t reflect in the UI, and other times it just doesn’t update at all. I suspect it might be related to how Combine is handling the data stream and the threading, but I'm unsure how to effectively debug this. Any insights on how to ensure the UI updates upon data changes after a background fetch would be greatly appreciated! I'm open to any suggestions. Any pointers in the right direction?