👀 Views: 21 💬 Answers: 1 📅 Created: 2025-06-08

core-data swiftui background-fetch Swift

I've spent hours debugging this and I'm working with a crash when trying to perform a background fetch in my iOS 16 app that uses Core Data in conjunction with SwiftUI. The background fetch is set up to update the local database with new data from a remote API, but when I attempt to save the context within the background task, I'm receiving the following behavior: `Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'The NSManagedObjectContext is not bound to a persistent store.'`. I have followed the usual steps to create a background context as shown below: ```swift func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) { let backgroundContext = persistentContainer.newBackgroundContext() backgroundContext.perform { [weak self] in self?.fetchData { newData in if newData { do { try backgroundContext.save() completionHandler(.newData) } catch { print("behavior saving context: \(behavior)") completionHandler(.failed) } } else { completionHandler(.noData) } } } } ``` However, I suspect that the persistent store may not be correctly initialized for the background context since I'm initializing it only once on app launch and then referencing it directly. Here’s how I set up my Core Data stack: ```swift lazy var persistentContainer: NSPersistentContainer = { let container = NSPersistentContainer(name: "MyModel") container.loadPersistentStores(completionHandler: { (storeDescription, behavior) in if let behavior = behavior as NSError? { fatalError("Unresolved behavior \(behavior), \(behavior.userInfo)") } }) return container }() ``` I’ve tried reloading the persistent stores and ensuring that the context is correctly set up before saving, but the scenario continues. Has anyone experienced this question or can provide insight into what I might be missing? Any advice would be much appreciated.