Question

I have 3 ViewControllers.

Each of these controllers needs to perform calculations on a given Core Data Object.

These calculations, vary considering the type of object and the controller.

The methods are,

performTimeOperations:(Year *) // VC1
performTimeOperations:(Month *) // VC2
performTimeOperations:(Day *) // VC3

It’s about 50 lines of code for each one.

But the changes in code for each of them, are so small, that I really wanted to pass an ID, like this,

performTimeOperations:(id)

And make it handle every type of object I throw at it.

Mostly because every change I make, I have to do it in 3 places.

Where would you implement this? And how?

Should I be looking at categories? I also don’t think this should go in my appDelegate … But it certainly would be a better place than to have 3 implementations of it?

Any advice is appreciated

Thank you!

Nuno

Answer 1

Why not make all your core data objects inherit from a common base class which implements this method?

i.e. instead of

Day -> NSManagedObject
Month -> NSManagedObject
Year -> NSManagedObject

you would have

Day -> MyDateType -> NSManagedObject
Month -> MyDateType -> NSManagedObject
Year -> MyDateType -> NSManagedObject