How to know when UITableView did scroll to bottom in iPhone?

I would like to know when a UITableView did scroll to bottom in order to load and show more content, something like a delegate or something else to let the controller know when the table did scroll to bottom.

How can I do this?

Solution 1:

in the tableview delegate do something like this

ObjC:

- (void)scrollViewDidScroll:(UIScrollView *)aScrollView {
    CGPoint offset = aScrollView.contentOffset;
    CGRect bounds = aScrollView.bounds;
    CGSize size = aScrollView.contentSize;
    UIEdgeInsets inset = aScrollView.contentInset;
    float y = offset.y + bounds.size.height - inset.bottom;
    float h = size.height;
    // NSLog(@"offset: %f", offset.y);   
    // NSLog(@"content.height: %f", size.height);   
    // NSLog(@"bounds.height: %f", bounds.size.height);   
    // NSLog(@"inset.top: %f", inset.top);   
    // NSLog(@"inset.bottom: %f", inset.bottom);   
    // NSLog(@"pos: %f of %f", y, h);

    float reload_distance = 10;
    if(y > h + reload_distance) {
        NSLog(@"load more rows");
    }
}

Swift:

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let offset = scrollView.contentOffset
    let bounds = scrollView.bounds
    let size = scrollView.contentSize
    let inset = scrollView.contentInset
    let y = offset.y + bounds.size.height - inset.bottom
    let h = size.height
    let reload_distance:CGFloat = 10.0
    if y > (h + reload_distance) {
        print("load more rows")
    }
}

Solution 2:

Modified neoneyes answer a bit.

This answer targets those of you who only wants the event to be triggered once per release of the finger.

Suitable when loading more content from some content provider (web service, core data etc). Note that this approach does not respect the response time from your web service.

- (void)scrollViewDidEndDragging:(UIScrollView *)aScrollView
                  willDecelerate:(BOOL)decelerate
{
    CGPoint offset = aScrollView.contentOffset;
    CGRect bounds = aScrollView.bounds;
    CGSize size = aScrollView.contentSize;
    UIEdgeInsets inset = aScrollView.contentInset;
    float y = offset.y + bounds.size.height - inset.bottom;
    float h = size.height;

    float reload_distance = 50;
    if(y > h + reload_distance) {
        NSLog(@"load more rows");
    }
}