Functions of iOS-PCH files & amp; XCode:

Functions of iOS-PCH files & amp; how XCode creates Pch files:

In the old version of XCode, A pch file is automatically created after a project is created. Usually, some frequently used framework header files or macro-defined URL addresses are written in the file, this definition can be used globally, but the pch file is no longer provided after the project is created in Xcode6. Pch is called "precompiled header", that is, the pre-compiled header file, which helps to save development time and code maintenance time.

Creation method New File:

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In this way, you can use it.