June 2011
Intermediate to advanced
590 pages
19h 31m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Archiving
There are many ways to write data to the filesystem on iOS, and one of the most important is called archiving. Archiving is the process of taking one or more objects from memory and writing them to the filesystem. Unarchiving reads these objects back from the filesystem into memory.
Archiving works by creating an instance of NSCoder, which is essentially just a container for data, and placing objects and their data inside it. Once the NSCoder has all of the data you have instructed it to collect, it will be written to a specific file in the filesystem.
Not all objects can be archived – only those whose class conforms to the NSCoding protocol. The NSCoding protocol has two methods, and both are required: encodeWithCoder: (for archiving) ...
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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.