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 View Controller Lifecycle and Low-Memory Warnings
A view controller, like any other object, is created through alloc and init. It does not, however, create its view at that time. Instead, it waits until the view is really needed before it calls loadView. This lazy creation of the view is good: for example, if you have a tab view with a dozen view controllers, the view for any particular view controller will only be created if that particular tab is selected. You can see this behavior in the console when you build and run HypnoTime – you will only see the log message indicating that the CurrentTimeViewController’s view is loaded after you switch to the Time tab for the first time.
How does a view controller know when to load its view? When ...
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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.