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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NSUserDefaults
In this exercise, we will store a value to specify the map type that the user last selected so that the chosen type will automatically be displayed when the user launches the application again. This value will be stored in an instance of NSUserDefaults.
Every application has an instance of NSUserDefaults that it can access by sending the class message standardUserDefaults to the NSUserDefaults class. This instance of NSUserDefaults is like an NSMutableDictionary; you can set and remove objects in it using a key. It is also automatically read from disk when the application first accesses it and written to disk when modified.
The keys of an NSUserDefaults are always of type NSString. A key identifies a preference. An object represents ...
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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.