Retrieve a value from a table in a subview

From a view, I push a tableView where the back button is hidden. When one row is selected, the "back button" appear. I would like to pass to the value of the selected row as the user tap on the back button as content of a textField.

This is the code of the tableView (CategoryListController.m):

-(NSString *)ritornaValore {
    return valoreCategoria;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.navigationItem setHidesBackButton:NO animated:YES];
    NSDictionary *rowVals = (NSDictionary *) [categoryListItems objectAtIndex:indexPath.row];
    valoreCategoria = (NS开发者_如何学CString *) [rowVals objectForKey:@"key"];
    [self ritornaValore];
}

valoreCategoria is a NSString declared in the .h

In AddItemController i have this "categoryNameField" where i would like to put inside the value of "valoreCategoria"

categoryNameField.text = ?

Before pushing CategoryListController from AddItemController you should save reference (i.e. categoryController) to category list controller.

In viewWillAppear of AddItemController you should check if categoryController != nil. If it is not nil, then you can try to retrieve value : categoryNameField.text = [categoryController ritornaValore];. And if you don't need anymore categoryController then you should release it self.categoryController = nil;.

Check that categoryController is defined as @property (nonatomic, retain) CategoryListController *categoryController; and valoreCategoria as @property (nonatomic, retain) NSString *valoreCategoria;.