[MonoTouch] Inherited UIViewController tip

[competent_tech]

I just spent a good deal of time chasing down an issue with header files not
being generated for xibs after upgrading to MD 2.8/MT 5.0 and wanted to
share what worked for me in the hopes that it will save someone else some
time and hair.

Many of our views inherit from a hierarchy of base classes that ultimately
inherit from UIViewController. After upgrading to MD 2.8/MT 5.0, I opened
one of the views to make a change and discovered that the header file for
xcode had not been generated.

I played with various settings, added new views to confirm that the MD/XCode
integration was working correctly, and finally changed the base class for
the view back to UIViewController. As soon as I did this, the header file
was generated.

I then went and looked at the base classes and they were still registered
correctly, but I did notice it was a more verbose registration statement
than the new views that I had created: the existing classes were registered
with the fullly qualified path to the attribute
(Monotouch.Foundation.Register) whereas the new views included a using
Montouch.Foundation statement and the Register attribute on its own.

As soon as I changed the base classes to the Register attribute only, the
header file was generated.

So, if you are upgrading to MD 2.8/MT 5.0 and run into issues with the
header files not being generated, try changing your
Monotouch.Foundation.Register attributes to Register.

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