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I have seen many developers that add various convenience macros to the Prefix.pch of their iOS projects.
What do (or don't) you recommend adding to the iOS Prefix.pch file? What does your Prefix.pch look like?
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pch is a precompiled header. Precompiled headers were invented to make compiling faster. Rather than parsing the same header files over and over, these files get parsed once, ahead of time.
In computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.
From your Xcode menu, select File > New > File... From iOS template options, select Other > PCH file. Name the file <target_name>-Prefix. pch, and then select Create.
Ewww… don't put macros in a .pch file! A .pch file is, by definition, a project specific precompiled header. It really shouldn't be used beyond the context of the project and it really shouldn't contain anything but #includes and #imports.
If you have some macros and such that you want to share between headers, then stick 'em in a header file of their own — Common.h or whatever — and #include that at the beginning of the .pch.
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