Update NSFetchedResultsController using performBackgroundTask

Question

I have an NSFetchedResultsController and I am trying to update my data on a background context. For example, here I am trying to delete an object:

Answer 1

The view context will not update unless you have set it to automatically merge changes from the parent. The viewContext is already set as child of any backgroundContext that you receive from the NSPersistentContainer.

Try adding just this one line:

persistentContainer.viewContext.automaticallyMergesChangesFromParent = true

Now, the viewContext WILL update after the backgroundContext has been saved and this WILL trigger the NSFetchedResultsController to update.