Question

There’s something I don’t understand with tableviews: how to add a new item in a table view.

Here’s what I do: when i click on a button “+”, the modal controller appears, we enter a new item, and the table view should be edited, with a new item at the bottom. In the rootViewController, I attach the tableWebsites mutable array to the modal viewcontroller, so we have a copy of the mutable array and we can add the new item at the end of this copy:

ModifViewController *addView = [[ModifViewController alloc] initWithNibName:@"ModifViewController" bundle:nil];  
addView.tabWebSites = self.tabWebSites;  

And finally, in the rootViewController, we say :

[self.tableView reloadData];

So we copied the mutable array in RootView… to be edited in ModifView… but how does the tableview know that the mutable array tableWebsites edited in ModifView… is the one that should “fill” the table view? because we have a tableWebsites in RootView… and another tableWebsites in ModifView… in order to edit it. So i would think that : even if we say “reloadData”, it will reload the same mutable array in the RootView.

Do you understand what i mean? i’m sorry if it’s a mess, i have trouble to make myself clear 😉 Thanks for your answer.

Paul

Answer 1

UITableView objects are actually asking their data sources for the values to display, as well as the number of sections, etc…Sending reloadData to the table view will make it re-asking these values.

So I think no matter with the array the data source is picking the values from, but these methods should always return the correct value.

Useful links :

Table View programming guide

UITableView class reference

UITableViewDataSource protocol reference