June 2011
Intermediate to advanced
590 pages
19h 31m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, Second Edition
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For the More Curious: Retain Cycles
A view hierarchy is made up of many parent-child relationships. When we talk about view hierarchies, we call parents superviews and their children subviews. When a view is added to a view hierarchy, it is retained by its superview, as shown in Figure 6.7.
Figure 6.7 View hierarchy ownership
Every subview has a pointer back to its superview so that it can send its superview messages. The superview property of a UIView is set to its superview when the view is added to a view hierarchy. (When a view is not part of a view hierarchy, superview is nil.)
Superviews are not retained by their subviews. Why not? Well, ...
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