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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Recipe: Centering Views
To center views, associate their center properties (centerX and centerY) with the corresponding properties in their container. Recipe 5-3 introduces a pair of methods that retrieve a view’s superview and apply the equality relation between their centers.
Notice that these constraints are added to a parent view and not the child view. This is because constraints cannot reference views outside their own subtree. Here’s the error that’s generated if you attempt to do otherwise:
2012-06-24 16:09:14.736 HelloWorld[65437:c07] *** Terminating app due to uncaught exception 'NSGenericException', reason: 'Unable to install constraint on view. Does the constraint reference something from outside the ...
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