You can create a cell-specific model which you will initialize with your model object, and it will compute titles, images and other properties for the cell.
Dealing with Complex Table Views in iOS and Keeping Your Sanity
Marin Benčević

Actually, models should not responsible any modification. It should only store domain-specific information. If you need to any modification to your models you should use ViewModel or other equivalents like Presenter, Interactor.

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