Call methods between MainViewController.m and FlipsideViewController.m?

If you import the header instead, that should give you all the necessary declarations, but you won't have "duplicate symbol" linker errors. This is a "standard"/common practice for writing (Objective-)C code.

(layman's terms) In Objective-C you can only use objects that each file knows about. In this example you are trying to use a MainViewController in the FlipsideController. M file.

The FlipsideController. M has no idea what a MainViewController is, so it throws errors because it doesn't know what it is or how to use it. You have two options for telling the Flipsidecontroller what a MainViewController is, you can import the header (#import "MainViewController.

H") which will give you full access to everything defined in the FlipSideController.h. (You should probably never import a . M unless you really know what your doing) You can also create a forward declaration - @class FilpsideControllerin the .

H and import the file in the .m. This is useful to avoid circular imports etc.

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