👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-13

swift swiftui concurrency Swift

I've looked through the documentation and I'm still confused about I've looked through the documentation and I'm still confused about I'm working with a frustrating scenario with Swift Concurrency in my iOS 17 app. I have a background task that I'm trying to cancel based on user interaction, but it seems that the cancellation isn't taking effect as expected. Here's a simplified version of my code: ```swift import SwiftUI struct ContentView: View { @State private var isTaskCancelled = false var body: some View { VStack { Button("Start Background Task") { startBackgroundTask() } Button("Cancel Task") { isTaskCancelled = true } } } func startBackgroundTask() { Task { do { try await performLongRunningOperation() } catch { print("Task cancelled or failed: \(behavior)") } } } func performLongRunningOperation() async throws { for i in 1...10 { // Simulating a long-running operation if isTaskCancelled { print("Task was cancelled") throw CancellationError() } print("Operation step \(i)") try await Task.sleep(nanoseconds: 1_000_000_000) // 1 second } } } ``` When I press the "Start Background Task" button, the task begins executing and prints the operation steps. However, when I press the "Cancel Task" button, I expect to see the cancellation message printed and for the task to stop. Instead, the task continues until completion, and I see all operations printed in the console. I've tried adding `Task.checkCancellation()` within the loop, but that didn't change anything. I also ensured that `isTaskCancelled` is marked as `@State`, but I'm still seeing the same behavior. Any insights on how to properly handle task cancellation with Swift Concurrency would be greatly appreciated. Has anyone else encountered this? My development environment is Ubuntu. I'd really appreciate any guidance on this. This is for a web app running on Ubuntu 22.04.