Goal: Create the DetailController.xib.
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In the SUP101 Xcode project, select .
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Select Cocoa Touch Class, UIViewController subclass, and With XIB for user interface. Then click Next.

The "With XIB for user interface" option creates a NextStep Interface Builder (nib) file to go with the view controller and adds it to the SUP101 Xcode project.
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In the next window, in File Name, enter DetailController.m, ensure that Also create DetailController.h is selected, and click Finish.
The new source files contain stub implementations of various methods.