background-processing

What problem does it solve?

iOS background execution is constrained and unpredictable. This Skill provides comprehensive guidance to implement, debug, and verify BGTaskScheduler tasks so they run reliably across app launches and system conditions.

Core Features & Use Cases

• Registration and scheduling for BGAppRefreshTask, BGProcessingTask, BGContinuedProcessingTask, beginBackgroundTask, and Background URLSession.
• Expiration handling, progressive task completion, and issues diagnosis with WWDC-backed scheduling factors.
• Swift 6 cancellation integration to bridge expiration with cooperative cancellation in async code.

Quick Start

1. Register a task in didFinishLaunchingWithOptions: BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.yourapp.refresh", using: nil) { task in self.handleAppRefresh(task: task as! BGAppRefreshTask) }
2. Schedule the task when the app goes to background: let request = BGAppRefreshTaskRequest(identifier: "com.yourapp.refresh") request.earliestBeginDate = Date(timeIntervalSinceNow: 15 * 60) try BGTaskScheduler.shared.submit(request)
3. Implement the handler with an expirationHandler and completion: func handleAppRefresh(task: BGAppRefreshTask) { task.expirationHandler = { self.currentOperation?.cancel() } self.fetchLatestContent { _ in task.setTaskCompleted(success: true) } }