Question

Is there a way to trigger an event, such as with an IBAction, when a user scrolls to the bottom of a UITableView? I would like to add more rows if this happens. How do I do this?

Answer 1

Simply listen to the scrollViewDidScroll: delegate method, compare the content offset with the current possible offset and if lower then some threshold call your method to update the tableview. Don’t forget to call [tableView reloadData] to make sure it reload the newly added data.

EDIT: Put together abstract code, not sure if it works, but should.

- (void)scrollViewDidScroll: (UIScrollView *)scroll {
     // UITableView only moves in one direction, y axis
     CGFloat currentOffset = scroll.contentOffset.y;
     CGFloat maximumOffset = scroll.contentSize.height - scroll.frame.size.height;

     // Change 10.0 to adjust the distance from bottom
     if (maximumOffset - currentOffset <= 10.0) {
          [self methodThatAddsDataAndReloadsTableView];
     }
}