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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Shadows, Borders, and More
A CALayer has many additional properties that affect details of how it is drawn. Once again, all of these drawing details can, of course, be applied equally to a UIView; changing these properties of the UIView’s underlying layer changes how the view is drawn. Thus, these are effectively view features as well.
A CALayer can have a shadow, defined by its shadowColor, shadowOpacity, shadowRadius, and shadowOffset properties. To make the layer draw a shadow, set the shadowOpacity to a nonzero value. The shadow is normally based on the shape of the layer’s nontransparent region, but deriving this shape can be calculation-intensive (so much so that in early versions of iOS, layer shadows weren’t implemented). You can vastly improve performance by defining the shape yourself and assigning this shape as a CGPath to the shadowPath property.
A CALayer can have a border (borderWidth, borderColor); the borderWidth is drawn inward from the bounds, potentially covering some of the content unless you compensate.
A CALayer can be bounded by a rounded rectangle, by giving it a cornerRadius greater than zero. If the layer has a border, the border has rounded corners too. If the layer has a backgroundColor, that background is clipped to the shape of the rounded rectangle. If the layer’s masksToBounds is YES, the layer’s content and its sublayers are clipped by the rounded corners.
Like a UIView, a CALayer has a hidden property that can be set to take it and its sublayers out ...
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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.