Background Mode

What is Background fetch?

Background fetch is a feature in iOS that allows your app to periodically fetch new content, update its data, or perform other tasks in the background even when the app is not actively running. This can enhance the user experience by ensuring that the app always has up-to-date information when the user opens it.

It allows your app to perform limited tasks in the background at opportune times determined by the operating system.

Here’s how you can implement background fetch in Swift:

1. Enable Background Modes in the capability section.
2. Implement the Background Fetch Delegate Method: In your app delegate (AppDelegate.swift), you need to implement the application(_:performFetchWithCompletionHandler:) method. This method will be called by the system when it's time for your app to perform background fetch.

func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    // Perform your background fetch tasks here
    
    // Call the completion handler when you're done
    completionHandler(.newData) // or .noData or .failed
}

You should perform the necessary tasks, such as fetching new data from a server, updating your app’s content, and then call the completion handler to inform the system of the result of your fetch.
Don’t forget to call completionHandler callback. If you do not call this callback, the system does not aware…