- Make new file: ⌘cmd+N
- iOS/Mac > Other > PCH File > YourProject-Prefix.pch.
- Make sure you display “All” and not “Basic”. (Blue buttons)
- Project > Build Settings > Search: “Prefix Header”.
- Under “Apple LLVM 7.0” you will get the Prefix Header key.
- Type file directory. e.g: “$(SRCROOT)/$(PROJECT_NAME)/ProjectName-Prefix.pch”.
- Clean project: ⌘cmd+⇧shift+K
- Build project: ⌘cmd+B