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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Rotation
A major part of a view controller’s job is to know how to rotate the view. The user will experience this as rotation of the app itself: the top of the app shifts so that it is oriented against a different side of the device’s display. There are two complementary uses for rotation:
- Compensatory rotation
- The app rotates to compensate for the orientation of the device, so that the app appears right way up with respect to how the user is holding the device. The challenge of compensatory rotation stems, quite simply, from the fact that the screen is not square. This means that if the app rotates 90 degrees, the interface no longer fits the screen, and must be changed to compensate.
- Forced rotation
- The app rotates when a particular view appears in the interface, or when the app launches, to indicate that the user needs to rotate the device in order to view the app the right way up. This is typically because the interface has been specifically designed, in the face of the fact that the screen is not square, to appear in one particular mode (portrait or landscape).
In the case of the iPhone, no law says that your app has to perform compensatory rotation. Most of my iPhone apps do not do so; indeed, I have no compunction about doing just the opposite, forcing the user to rotate the device differently depending on what view is being displayed. The iPhone is small and easily reoriented with a twist of the user’s wrist, and it has a natural right way up, especially because it’s ...
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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.
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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.