How to update table view cell?

Question

I have a UITableView with one big cell and many small cells. When I receive content from server I update my UITableView with function - (BOOL)performFetch:(NSError **)error (NSFetchedResultsController). I noticed that my big cell has dublicate after update and the second cell doesn't reload. When I scroll down and scroll to top table looks good. How can I solve my problem?

Answer 1

"performFetch" updates the datasource but the tableview itself is not updated.

For updating the tableview use either

- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths
              withRowAnimation:(UITableViewRowAnimation)animation

or

- (void)reloadSections:(NSIndexSet *)sections
      withRowAnimation:(UITableViewRowAnimation)animation

You can pick the animation you like best, for example UITableViewRowAnimationMiddle or just UITableViewRowAnimationAutomatic

For performance reasons update only as much as necessary.