UIRefreshControl at the bottom of the UITableView

Question

Is it possibile add UIRefreshControl at the bottom of the UITableView? I would use it to load more data. Please, Any suggest?

Answer 1

I believe there won't be any simple solution to this problem. May be someone could write a separate library to implement this behaviour plus it will cause more complications once you cache data in tableview.

But let us break down the problem and that might help you in achieving what you want. I have used the following code to add more rows in the app:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    float endScrolling = scrollView.contentOffset.y + scrollView.frame.size.height;
    if (endScrolling >= scrollView.contentSize.height)
    {
        NSLog(@"Scroll End Called");
        [self fetchMoreEntries];
    }
}

Or you could do something like that:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if ((scrollView.contentOffset.y + scrollView.frame.size.height) >= scrollView.contentSize.height)
    {
        if (!self.isMoreData)
        {
            self.MoreData = YES;

            // call some method that handles more rows
        }
    }
}

You must have seen such methods in many question as i have described above and certainly not what you have asked for. But what you can do is while the above code in in process to load more data, you can add a subview and show a couple of images similar to what UIRefreshControl offers. Add the images in the subview to be shown as a progress until the above code gets executed. Home this helps.

By the way, i will suggest you not to do that as it will just waste your time for making something so smaller unless you are just doing it for learning purposes.

Answer 2

For UITableView I suggest the following approach:

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{    
    // if this is the last row that we have in local data
    // and we didn't reach the total count of rows from the server side
    if (count == indexPath.row+1 && count < total)
    {
        // .. fetch more rows and reload table when data comes
    }
}

I didn't use the scroll view methods intentionally because the scroll view is slow. It happens that scroll view scrolls, we request more data, refresh more rows, and scroll view is not yet finished with scrolling, it is still decelerating and causing problems with fetching more data.