I seem to have stumbled upon the same problem now as siancu here, 
http://monotouch.2284126.n4.nabble.com/Question-about-the-Multi-Screened-Application-tutorial-td4404379.html
Question about the Multi-Screened Application tutorial , where the .h file
for a ViewController disappears, causing the project to generate a host of
errors when you build it.

I've been able to pretty reliably reproduce the problem with these steps: 

1) Create a new solution in MonoDevelop (number of views doesn't matter). 

2)  Double-click a ViewController xib to edit it in Interface Builder. 

3) In IB, add one or more buttons or other screen elements, open the
Assistant Editor to access the ViewController.h file, ctrl+drag one or more
of them over and create outlets like normal. 

4) Quit IB and go back to MonoDevelop. Make significant changes to the code
in the ViewController file in question. In particular, cutting a big chunk
of of the code and pasting in replacement code seems to do the trick. 

(I haven't been able to confirm if quitting and relaunching MonoDevelop
between steps 4 and 5 is part of the problem or not.)

5) Double-click on that ViewController's xib again, relaunching IB. Click on
the Assistant Editor button. If the problem occurs, you won't have a .h file
anymore and the Assistant Editor screen will say "No Assistant Results". 

Has anyone else experienced this, and more importantly, is there any way to
to recover or recreate the missing .h file (or get MonoTouch to generate a
new one) without rebuilding the project from scratch? 


--Chris M.


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