I'm a beginner with Grand Central Dispatch (GCD) and Core Data, and I need your help to use Core Data with CGD, so that the UI is not locked while I add 40.000 records to Core Data.
I know that CD is not thread safe, so I have to use another context, and then save the data and merge contexts, as far as I was able to understand from some articles.
What I couldn't do yet, is put the pieces together.
So, in my code, I need your help on how to to that.
I have:
/*some other code*/
for (NSDictionary *memberData in arrayWithResult) {
//get the Activities for this member
NSArray *arrayWithMemberActivities = [activitiesDict objectForKey:[memberData objectForKey:@"MemberID"]];
//create the Member, with the NSSet of Activities
[Members createMemberWithDataFromServer:memberData
andActivitiesArray:arrayWithMemberActivities
andStaffArray:nil
andContactsArray:nil
inManagedObjectContext:self.managedObjectContext];
}
How can I transform this to work on the background, and then, when done saving, save the data and update the UI, without blocking the UI while saving the 40.000 objects?
Best Answer
Here's a good example for you to try. Feel free to come back if you have any questions:
And in response to the context save notification:
And don't forget to remove the observer from the notification center once you are done with the background thread context.