I have seen many times people use many managedObjectContext, but aside from when using the Undo manager, what is the real reason for using multipleManagedObjectContext? Why can it be useful to use more than one? Could you please show a few examples?
1 Answers
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Managed object contexts are not thread safe so if you ever need to do any kind of background work with your Coredata objects (i.e. a long running import/export function without blocking the main UI) you will want to do that on a background thread.
In these cases you will need to create a new managed object context on the background thread, iterate through your coredata operation and then notify the main context of your changes.
You can find an example of how this could work here Core Data and threads / Grand Central Dispatch
