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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For the More Curious: Redrawing Views
When a UIView instance is sent the message setNeedsDisplay, that view is marked for re-display. View subclasses send themselves setNeedsDisplay when their drawable content changes. For example, UITextField will mark itself for re-display if it is sent the message setText:. (It has to redraw if the text it displays changes.)
When a view has marked itself for re-display, it is not immediately redrawn; instead, it is added to a list of views that need updating. Your application is a giant infinite loop called the run loop. The run loop’s job is to check for input (a touch, Core Location updates, data coming in through a network interface, etc.) and then find the appropriate handlers for that event (like an ...
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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.