Xcode7 How to add a PCH file

When we write the project, most of the macro definitions, the header file import are here, the main reason Xcode6 remove precompile Prefix header may be that the Prefix header greatly increased the build time. But without the prefix header to manually import the header files by manual @import, the programming convenience is lost and the build time is reduced, and all PCH is necessary for iOS development.

1,command+n, open the new File window: ios->other->pch file, create a PCH document: "Project name-prefix.pch":

2, add the path to the precompile header option in building setting "$ (srcroot)/project name/PCH filename" (For example: $ (srcroot)/lotteryfive/ LOTTERYFIVE-PREFIX.PCH)

Yes, compile the program, if you have an error check the path you added is correct.

3, precompile Prefix header is yes, pre-compiled PCH file will be cached, can improve the speed of compilation

Xcode7 How to add a PCH file