November 2009
Beginner to intermediate
432 pages
9h 9m
English
Content preview from iPhone® Application Development For Dummies®, 2nd 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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Chapter 6. While Your Application Is Running
In This Chapter
Seeing how applications actually work
Getting a handle on how nib files work
Following what goes on when the user taps your application icon
Managing events
Creating an app with a view
Remembering memory management
Knowing what else you should be aware of at runtime
Taking a peek at the iPhone application architecture (Chapter 2) and working through the steps of creating the user interface for an application (Chapter 5) are all fine and dandy, but at some point, you have to add some code — and to do that, you need an additional frame of reference: You need to know how all this stuff works at runtime.
Uncovering the mysteries of runtime is the goal of this chapter.
Okay, if you can't wait to code, then by all means skip to the next chapter. Honestly, if I were you (or me without benefit of hindsight), I'd be itching to do the same thing. But you'll probably run into trouble, just as I did, if you don't take some time beforehand to examine how the objects work together to deliver the user's experience of the application.
Application Anatomy 101 — The Life Cycle
The short-but-happy life of an application begins when a user launches it by tapping its icon on the Home screen. The system launches your application by calling its main function.
The main function does only three things:
Sets up an autorelease pool.
Calls the
UIApplicationMainfunction.At termination, releases the autorelease pool.
To be honest, this whole main function thing is ...
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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.