判断UITableView滚动是否到底

- (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;

    float reload_distance = -20;

    if(y > h + reload_distance) {

        //距离到底 20 像素

　　　　　// todo

    }

            

    }

}