Handling Rapid State Changes in SwiftUI with Combine - State implementation guide as Expected
I'm having a hard time understanding I need some guidance on I've searched everywhere and can't find a clear answer... I've encountered a strange issue with I'm refactoring my project and This might be a silly question, but I am building a SwiftUI application that utilizes Combine for handling state changes, but I'm working with an scenario where my view doesn't update as expected when the state changes rapidly. I have a `ViewModel` that publishes an array of data. The view is supposed to display this data in a `List`, but when the data updates too quickly (for instance, when fetching new data in a loop), the UI doesn't reflect the changes. Here's a simplified version of my `ViewModel`: ```swift import SwiftUI import Combine class ViewModel: ObservableObject { @Published var items: [String] = [] private var cancellables = Set<AnyCancellable>() func fetchData() { for i in 0..<10 { DispatchQueue.global().asyncAfter(deadline: .now() + Double(i) * 0.1) { DispatchQueue.main.async { self.items.append("Item \(i)") } } } } } ``` And my view is pretty straightforward: ```swift struct ContentView: View { @StateObject var viewModel = ViewModel() var body: some View { List(viewModel.items, id: \ .self) { item in Text(item) } .onAppear { viewModel.fetchData() } } } ``` When I run this code, the `List` appears to be exploring, and I don't see the items updating in the UI until after all inserts are completed. I expect the `List` to update incrementally with each item added, but it only seems to refresh all at once at the end. I’ve tried wrapping the `append` call in `DispatchQueue.main.async`, but that doesn’t seem to help. I also considered using a `PassthroughSubject` to publish updates, but I’m unsure how to implement that effectively. Am I missing something in the way Combine works with UI updates in SwiftUI? Any best practices for ensuring the UI reflects rapid state changes? Is there a better approach? Thanks, I really appreciate it! This is for a desktop app running on Windows 10. Is there a simpler solution I'm overlooking? I recently upgraded to Swift 3.9. Is there a simpler solution I'm overlooking? The project is a application built with Swift. I'm working in a Ubuntu 20.04 environment.