Recipe: Creating Universal Split View/Navigation Apps

Recipe 7-4 modifies Recipe 7-3’s split view controller to provide a functionally equivalent application that runs properly on both iPhone and iPad platforms. Accomplishing this takes several steps that add to Recipe 7-3’s code base. You do not have to remove functionality from the split view controller approach, but you must provide alternatives in several places.

Recipe 7-4 uses a macro to determine whether the code is being run on an iPad- or iPhone-style device. It leverages the UIKit user interface idiom as follows:

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#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

This macro returns YES when the device characteristics are iPad-like rather ...

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