December 2016
Intermediate to advanced
416 pages
15h 21m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, 6th Edition
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5 View Controllers
A view controller is an instance of a subclass of UIViewController. A view controller manages a view hierarchy. It is responsible for creating view objects that make up the hierarchy and for handling events associated with the view objects in its hierarchy.
So far, WorldTrotter has a single view controller, ConversionViewController. In this chapter, you will update it to use multiple view controllers. The user will be able to switch between two view hierarchies – one for viewing the ConversionViewController and another for displaying a map (Figure 5.1).
Figure 5.1 The two faces of WorldTrotter
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