December 2013
Intermediate to advanced
132 pages
1h 58m
English
Content preview from Objective-C Quick Syntax Reference
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CHAPTER 21
Key-Value Coding
Key-Value Coding Defined
Normally when you want to get or set property values in an object you use dot notation to get a reference to the property to change the value. However, with key-value coding you can store and retrieve property values indirectly using string keys. Applications that require archiving need this type of functionality so that apps can retrieve object data from archive files.
Setting Property Values
You can use key-value coding to set property values. To set property values, you must use the setValue:forKey: message and provide the new property value and the NSString name of the property.
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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.