Handling Background Fetch Not Triggering as Expected in iOS 15+
I've spent hours debugging this and I need some guidance on I'm maintaining legacy code that I'm testing a new approach and I'm working on a personal project and I'm currently developing an iOS app using SwiftUI, and I've implemented background fetch functionality to update data periodically... However, it seems that the background fetch does not trigger as expected on devices running iOS 15 and later. I've configured the app in the capabilities to enable "Background Modes" and checked the "Background fetch" option. Here’s a simplified version of the code I’m using in my `AppDelegate`: ```swift func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) { fetchData { newDataAvailable in if newDataAvailable { completionHandler(.newData) } else { completionHandler(.noData) } } } private func fetchData(completion: @escaping (Bool) -> Void) { // Simulate network fetch dispatch_queue.asyncAfter(deadline: .now() + 3) { // Assume we fetched new data completion(true) } } ``` I've also implemented the following in my `Info.plist`: ```xml <key>UIBackgroundModes</key> <array> <string>fetch</string> </array> ``` Despite this setup, the `performFetchWithCompletionHandler` method isn't being called most of the time. I've tried debugging by adding logs inside the method to see if it ever gets triggered, but the logs rarely show up. I've verified that the app has the necessary permissions and is not restricted by device settings. I've also looked into the fetch interval by setting it in `applicationDidFinishLaunching`: ```swift UIApplication.shared.setMinimumBackgroundFetchInterval(UIApplication.backgroundFetchIntervalMinimum) ``` Still, the scenario continues. Could it be that iOS 15+ has changed how background fetch works, or am I missing something in my implementation? Any insights or best practices here would be greatly appreciated. What's the best practice here? How would you solve this? What's the best practice here? This is for a service running on Windows 10. What's the correct way to implement this? I'm developing on Debian with Swift. What would be the recommended way to handle this? My team is using Swift for this REST API.