问题
When I try to change a view controller name in the .h and .m, I got this error:
Lexical or PreProcessor Issue
'MyViewController.h' file not found.
Just for information, the application run correctly although this lexical error.
回答1:
Try cleaning your build by going into Product menu and clicking on Clean.
I hope this helps you.
来源：https://stackoverflow.com/questions/10027586/lexical-or-preprocessor-issue-myviewcontroller-h-file-not-found