Help to insert a new section in a TableView

Question

Hi,

Everyone keep writing about deleting a section. Well, I can't seem to get one added.

Currently, I am trying like this (which fails with NSInternalInconsistencyException):

UITableView *tv = (UITableView *) self.tableView;

if ([tv numberOfSections] == 1)
{
     [tv beginUpdates];
     [tv insertSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationTop];

     NSLog(@"Inserted.. Brace for impact.");
     [tv endUpdates];
}

NSLog(@"Section count after update: %d", [tv numberOfSections]); // Never reached

If I am correct, inserting a section with index 0 should place it at the top, bumping all the other sections down, right? Well, if I write out the numberOfSections right after the insertSections, there appears to be no change in the number of sections.

Any ideas?

Johan

Answer 1

Did you also update your data source? You can't just update the table view without also updating the underlying data.

Answer 2

You need to update numberOfSectionsInTableView message of UITableViewDataSource class.

Answer 3

Yes, thanks to both of you.

After some juggling, I finally managed to get it working. It was a combination of both your suggestions. The new data was never inserted, but also I did not have to increase the row count for the first item inserted, but only the second.