Used for the global. PCH File Settings

The first step: command+n create a. pch file, the file name can be set

Step Two: Add some globally used macros to the PCH and commonly used afnetworking-like three-party libraries

Step three: Open the project's building Setting, search the prefix Header

$ (srcroot) refers to the project root directory, after the set up will automatically show the path, after compiling you will find that you can be transferred to any of the pages you write in the. pch File macro

Used for the global. PCH File Settings