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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Using the Context Pointer Defensively
In order for any class to observe key-value changes, it must implement the observeValueForKeyPath(_:ofObject:change:context:) method; it is not possible to provide a different method to KVO. Consequently, it is possible to mistakenly intercept notifications intended for a superclass.
Consider the case of some class Maple, which is a subclass of some other class Tree. Both classes observe Environment’s key path season independently. Unless the developer takes precautions, Maple will receive its key-value-observing messages and those intended for Tree, because Maple has effectively overridden Tree’s KVO method. To fix this, Maple must correctly distinguish between KVO notifications intended for it ...
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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.