December 2013
Intermediate to advanced
464 pages
14h 46m
English
book
Learning Mobile App Development: A Hands-on Guide to Building Apps with iOS and Android
by Jakob Iversen, Michael Eierman
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Global Constants
The code you wrote previously uses literal string values to identify the key fields used in NSUserDefaults. This can be a problem, because if they aren’t spelled the same everywhere you use them, you will get some very strange error messages. One solution to this problem is to create an object to hold global constants, and then define the string keys in that object. Here’s how to update the code to be more robust.
1. Select File > New > File, and select Objective-C class in the Cocoa Touch category. Click Next.
2. Name the class Constants and enter NSObject for Subclass Of. Click Next and make sure to save the file inside the project folder, and that the Target for MyContactList CoreData is checked.
3. Open the Constants.h file ...
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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.