April 2015
Intermediate to advanced
556 pages
17h 47m
English
book
Cocoa Programming for OS X: The Big Nerd Ranch Guide
by Aaron Hillegass, Adam Preble, Nate Chandler
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide
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What Can Be Stored in NSUserDefaults?
You may have noticed that, aside from the scalar types, NSUserDefaults provides APIs for setting and getting objects. What kind of objects? Property list objects.
Property list objects are instances of the Objective-C classes NSDictionary, NSArray, NSString, and NSNumber. A plist data structure is composed entirely of these objects. As such you can store any data structure in NSUserDefaults that you like, as long as you can represent it as a plist. Since the Swift basic types are bridged to these types, you can store them without any issues. An example:
let userDefaults = NSUserDefaults.standardUserDefaults() let plistKey = "plist" if let plist: AnyObject = userDefaults.objectForKey(plistKey) { ...Become 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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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.
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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.