How do I differentiate source of scrollViewDidScroll call when both UITableView and UIScrollView are present?

Question

I am using both a UITableView and UIScrollView inside the same UIViewController.

My problem is when I scroll either the table view or scroll view the didScroll delegate call is fired.

How can i identify the source of the scrollViewDidScroll delegate call?

Answer 1

check the scrollView parameter given in the delegate.

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if(scrollView == self.tableView) {
      // its your tableView
    }
    else if(scrollView == self.scrollView) {
      // its your scrollView
    }
}

Answer 2

The didScroll method takes in a scrollview as an input

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    if(scrollView == self.tableViewInstance){//this is  your table view}
    else {//this is your scroll view}
}

You can check the input and see whether it is your scrollview or tableview which is calling the delegate method.

Answer 3

You can add tag for UIScrollView as 0 and add tag for UITableView as 1. Inside the delegate check for the tag to know which of this is scrolled and do your stuff:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
  {
       if(scrollViewl.tag == 0) // ur in scrollView
        if(scrollViewl.tag == 1) // ur in tableView
   }