In my previous projects, I can find the .pch file under Supporting Files.
But now in Xcode 6, I couldn't find any .pch file. Any steps should I do to produce this file?
Add the pch file which is under Others in File-New...and don't forget to add it to your LLVM6.0 - Language section of Build Settings as Project/whateveryounamedyourpchfile.pch