As opposed to targeting just iPhone? I need to make a decision on whether to target both, but I've only done iPhone development, so I can't really estimate how much longer it would take to do both an iPhone and an iPad app. Some information about what I'm trying to do:
Uses a navigation controller on iPhone, would use a split view controller on iPad
Has three separate views in a view controller in the iPhone version that I would display all in one view on the iPad version.
So I'm wondering, in general, by how much does it increase development time to target both? How rough is the answer? And also, how is the learning curve for an iPhone developer to learn to develop for iPad? This might be difficult to answer, but even rough estimates are better than none.