xcode iphone project and ipad project into universal app

If I have a project that was written for iphone and a project written for ipad. Is there a recommended way to combine them into a universal app?

My understanding is that you would take the existing app (iphone project) and convert it to a universal app then rename the classes to clas开发者_C百科s_iphone, class_ipad etc.

The process of coverting includes xcode generating a new MainWindow nib for the ipad and other related files... But this sound painful to go into the project and duplicate the files etc..

please advise.

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You may have to rename your NIBs to be iPhone and iPad specific, but you shouldn't have to do that with your classes. I am not saying that it won't be painful - just that it will be a different kind of pain. You will need to wrap certain code in:

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
    }
else
    {
    }

And you will need to be careful about classes (like UIPopoverController) that are specific to iPads.