Renaming A View Controller
See here
Renaming A Set Of View Files
Rename the .h, .m and .xib files
Update the name in the following places:
In #ViewController.h update @interface
In #ViewController.m update
#import
@implementation
In #ViewController.xib update
Select the Files Owner icon on the left, then the Identity Inspector tab and rename the Class in Custom Class to the new name.
Finally update any files that use the ViewController.