March 2014
Intermediate to advanced
672 pages
40h 11m
English
Content preview from The Core iOS Developer’s Cookbook, Fifth Edition
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Debugging Your Constraints
The most common problems you encounter when adding constraints programmatically are ambiguous and unsatisfiable layouts. Expect to spend a lot of time at the Xcode debugging console and don’t be surprised when you see a large dump of information that starts with the phrase “Unable to simultaneously satisfy constraints.”
iOS does its best at runtime to let you know which constraints could not be satisfied and which constraints it has to break in order to proceed. Often, it suggests a list of constraints that you should evaluate to see which item is causing the problem. This usually looks something like this:
Probably at least one of the constraints in the following list is one you don't ...
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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.
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.