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Add support for visibility depth

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This adds support for the concept of visibility depth.

Visibility essentially defines the number of user actions it would
take a user to have a view controller visible. Knowing a view controllers
visibility depth allows view controllers to take action such as clearing
out memory that can be restored at a later date.

This patch also add two new view controller subclasses which adopt
the ASManagesChildVisibilityDepth protocol. Any view controller
that has child view controllers can adopt this protocol to indicate
to the child what they're visibility is. For example, ASNavigationController
will return a visibility depth of it's own visibilityDepth + 1 for
a view controller that would be revealed by tapping the back button.
This commit is contained in:
Garrett Moon
2016-05-09 13:48:22 -07:00
parent b34e8d78de
commit af7a2f09d7
10 changed files with 420 additions and 5 deletions
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34
AsyncDisplayKit.xcodeproj/project.pbxproj
View File

@@ -272,6 +272,17 @@
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