March 2014
Intermediate to advanced
672 pages
40h 11m
English
Content preview from The Core iOS Developer’s Cookbook, Fifth 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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Coordinate Systems
As mentioned earlier, views live in two worlds. The frame and center of a view are defined in the coordinate system of its parents. The bounds and subviews of a view are defined in their own coordinate system. The iOS SDK offers several utilities that allow you to move between these coordinate systems, as long as the views involved live within the same UIWindow. To convert a point from another view into your own coordinate system, use convertPoint:fromView:. Here’s an example:
myPoint = [myView convertPoint:somePoint fromView:otherView];
If the original point indicated the location of some object, the new point retains that location but gives the coordinates with respect to myView’s origin. To ...
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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.