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What does this mean when programming iphone?

#pragma mark Internal API

I saw this in a book called xcode_quick_tour_iphoneOS.

Does anyone know about this?

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The #pragma is a special preprocessor directive that allows the C preprocessor to create largely portable extensions. Basically, when another preprocessor sees a pragma directive that he does not understand, he should ignore it.

In this case, #pragma mark intended to help with the documentation. When you add these lines to the source file, Xcode breaks your source code in its drop-down menu, which you can use to go to certain areas of your code (for example, defining functions or defining constants). If you add #pragma mark - , Xcode will add a horizontal separator to the drop-down menu.

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This directive is used to specify various parameters for the compiler. These parameters are specific to the platform and the compiler you are using. See your compiler’s manual or link for more information on possible options that you can define with #pragma.

If the compiler does not support a specific argument for #pragma, it is ignored - no error is generated.

See: http://www.cplusplus.com/doc/tutorial/preprocessor/ for an explanation of preprocessor directives

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Apple has an internal API that is not intended for use by application developers, so these pragmas will “hide” the API from the developer docs

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