March 2013
Intermediate to advanced
1000 pages
34h 51m
English
Content preview from Programming iOS 6, 3rd 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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Clean
From time to time, during repeated testing and debugging, and before making a different sort of build (switching from Debug to Release, or running on a device instead of the Simulator), it is a good idea to clean your target. This means that existing builds will be removed and caches will be cleared, so that all code will be considered to be in need of compilation and the next build will build your app from scratch.
The first build of your app after you clean will take longer than usual. But it’s worth it, because cleaning removes the cruft, quite literally. For example, suppose you have been including a certain resource in your app, and you decide it is no longer needed. You can remove it from the Copy Bundle Resources build phase (or from your project as a whole), but that doesn’t remove it from your built app. Only cleaning will do that, because it removes the built app completely.
To clean, choose Product → Clean. For more complete cleaning, hold Option to get Product → Clean Build Folder.
In addition, Xcode stores builds and project indexes in ~/Library/Developer/Xcode/DerivedData. From time to time, with Xcode not running, I like to move the contents of that folder to the trash. This is effectively a massive and even more complete clean of every project that you’ve opened recently. Alternatively, to trash the folder in DerivedData for a single project from within Xcode, switch to the Projects tab of the Organizer window (Window → Organizer), select the project at the left, ...
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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.