Question

I have a program that displays a list (a TableView).
When the user clicks an item, it’s detail is shown.
On the detail view, the user can ask to modify it so a modify window is shown.
Here, the user can ask to delete the item.
I would like at this time return to the list with the item deleted from the list and from the data source.

There may be thousands of methods to do this, but I wonder which is the best / good one.

Could you help me, and/or give me a good reference to read about this ?

Answer 1

at least Two options:

1. Delegation – Create a protocol called something like: TableDetailModifierDelegat
   and add methods like modifierDidChangedItem:(id)item
   or modifierDidDeleteItem:(id)item

and to the modifying view controller add instance variable id so when you done editing or deleting you will call the appropriate methods.

of course you will need to make your table view controller implement the protocol you created. if you modified or deleted an item you should update your data source and reload the data to the table.
also pass the Table View Controller as the delegate when creating the Modifying View Controller.

1. Passing The Data Model.
   This is much more simple to implement.
   you can simply pass your data model to the modifying view controller, and make the changes directly to the data model.
   You should keep the data model as Instance Variable in the modifying view controller.
   when you done, dont forget to reload the data to your table.