How to use beginBackgroundTaskWithExpirationHandler for already running task in iOS

Question

In my app, I am uploading images to server from iPhone. While sync if user press home button, App will close.

I want app must be running in background till sync fini

Answer 1

You should run your task after beginBackgroundTaskWithExpirationHandler or capture notification when the application change app's state to background and then cancel your current task and run again with beginBackgroundTaskWithExpirationHandler.