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

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