Some of this is directly from the Stanford series
UIView is part of UIKit Framework which is part of Cocoa.
It represents a rectangular part of the screen. With it you can:
- draw into the rectangular area
- process events (since it inherits from UIResponder)
View Hierarchies:
- every view has ONE superview (assuming the view has been put into another view)
- every view has ZERO or MORE subviews
UIWindow is a subclass of UIView
NOTE: there is only one UIWindow for an iPhone App
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