Why UITableView calls UIScrollView's delegate methods?

Question

I have an application, in which I have a UITableView inside a UIView, which is again inside a UIScrollView, so the hierarchy becomes like this:

UIScrollView -> UIView -> UITableView

The data inside my UITableView is filled properly.

Now, my problem is that, When I scroll my UITableView, the UIScrollView's delegate method scrollViewDidEndDecelerating: and scrollViewDidEndDragging:: gets called.

I don't want this behavior, what should I do to stop this behavior?

Any one please Help, Thank in advance!!!

Answer 1

UITableViewDelegate extends UIScrollViewDelegate. Hence the calling of the delegate methods.

To stop this you can set tableView.tag = 1000; when you alloc the tableView and in the UIScrollViewDelegate methods ( scrollViewDidEndDecelerating: and scrollViewDidEndDragging:: )add this at the very begining:

if(scrollView.tag == 1000)
    return;

Answer 2

Because UITableView inherits from UIScrollView. So it shows all the properties and behaviours of UIScrollView. If you dont want this then please do one thing.

Assuming you have another scrollview in your page.

in the viewDidLoad or from the XIB (if you have your tableview in the XIB), set a tag for your tableview.

in code,

self.objYourTableView.tag = 101;

then in the scroll view delegate

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
  {
       if(!(scrollView.tag == 101))
       {
          // Go for your code to run.
       }
  }

So that your code will skip if it called by the table view. Other cases it works perfect. Hope this will help you.