December 2016
Intermediate to advanced
416 pages
15h 21m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, 6th Edition
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Updating the Data Source
One problem with the app at the moment is that fetchInterestingPhotos(completion:) only returns the newly inserted photos. Now that the application supports saving, it should return all of the photos – the previously saved photos as well as the newly inserted ones. You need to ask Core Data for all of the Photo entities, and you will accomplish this using a fetch request.
Fetch requests and predicates
To get objects back from the NSManagedObjectContext, you must prepare and execute an NSFetchRequest. After a fetch request is executed, you will get an array of all the objects that match the parameters of that request.
A fetch request needs an entity description that defines which entity you want ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.