init is being called and I don't know why?

I am working on the iTuneU Stanford iPhone course HelloPoly drawing assignment, and I am getting a call开发者_运维技巧 to my object's init routine when I don't expect one. The callback seem to indicate that the call is coming from _loadMainNibFile (after other calls). What I am trying to understand is why is my object being init-ed implicitly. The source files can be found here: -- http://www.cavedrawings.com/hp2_files.zip

Can anyone tell me why the init routine would be called implicitly when loading the NIB file?

Most implementations of initWithCoder: ultimately call another initialization function. It's normal to stack initialization methods when you have a series of them that progressively add information to the initialization process.

_loadMainNibFile calls the initWithCoder: of the file owner of the nib which in turn calls another initialization method which leads up to the final init.

When a nib is loaded all objects within it get instantiated to do any prep work they need to do.

If you want a nib's object loaded and init'd later, put the object in a separate nib and explicitly load that nib when you need it.