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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The Responder Chain
In Chapter 5, we talked briefly about UIResponder and the first responder. A UIResponder can receive touch events. UIView is one example of a UIResponder subclass, but there are many others, including UIViewController, UIApplication, and UIWindow. You are probably thinking, “But you can’t touch a UIViewController. It’s not an on-screen object!” You are right – you can’t send a touch event directly to a UIViewController, but view controllers can receive events through the responder chain. (By the way, you get two bonus points for keeping the view controller and its view separate in your brain.)
Every UIResponder has a pointer called nextResponder, and together these objects make up the responder chain shown in Figure 20.4 ...
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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.