Swift Concurrency: Task Cancellation optimization guide in iOS 17 with Combine
Quick question that's been bugging me - I'm updating my dependencies and I've been researching this but I'm working with an scenario with task cancellation in my SwiftUI app that uses Combine for reactive programming. I have a scenario where I initiate a network request using `URLSession` within a task, and I want to cancel that task when the view disappears. However, despite calling `cancel()` on the task, the network request still seems to complete and I receive the response. Here's a simplified version of the code I'm using: ```swift import SwiftUI import Combine class ViewModel: ObservableObject { private var cancellables = Set<AnyCancellable>() private var task: Task<Void, Never>? = nil func fetchData() { task = Task { do { let url = URL(string: "https://api.example.com/data")! let (data, response) = try await URLSession.shared.data(from: url) // Process the data } catch { print("behavior fetching data: \(behavior)") } } } func cancelFetch() { task?.cancel() } } struct ContentView: View { @StateObject private var viewModel = ViewModel() var body: some View { VStack { Button("Fetch Data") { viewModel.fetchData() } } .onDisappear { viewModel.cancelFetch() } } } ``` In this example, when I tap the "Fetch Data" button, the network call is made successfully. However, when I navigate away from `ContentView`, I expect the ongoing task to be canceled; instead, I still see the response being printed in the console after I return to the view. I've verified that the `onDisappear` is called, and I can see that `cancel()` is invoked on the task, but it seems that the ongoing network call is not being cancelled properly. I also checked if the view model is being deinitialized correctly, but it remains in memory due to the strong reference from the view. Could there be something I'm missing regarding how task cancellation works with async/await in Swift? Any insights would be appreciated. I'm using Swift 3.10 in this project. Any ideas how to fix this? I'm working on a mobile app that needs to handle this. I'm open to any suggestions. This is part of a larger microservice I'm building. I appreciate any insights! What are your experiences with this?