Why do we need to create the data model file using Cocoa Touch class? Why can’t we use the Swift file and make it a subclass of NSPbject?
You can, if you wanted to 
There’s generally more than one way of doing things. So the book shows you the different ways as you progress through it - doesn’t mean that you have to do it exactly as the book says. You can certainly do it a different way if you want to. Using Cocoa Touch class saves a little bit of typing since you don’t have to add the boilerplate for extending NSObject.
Thank you very much, very clear explanation:ok_man:t2:.
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