How to detect scrolling of UITableView?

Question

There is a similar question to this but answer is very general, vague.( Detecting UITableView scrolling ) Please don\'t dismiss. I am looking for concrete solution.

I ha

Answer 1

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    if (scrollView == myTableView){
       // Your code here.....
    }
}

Answer 2

I had the same problem, and I got some ideas from the answers above to fix it, but not only the app crashes if I want to refresh while the table view is being scrolled, but also it crashes if I scroll while it's being refreshed. So the extended solution to fix the problem under all circumstances is to:

---

1.1. Disable scrolling if the user has pressed the refresh button

1.2. Enable scrolling once the refresh process is done

---

2.1. Disable the refresh button if the user is scrolling

2.2. Enable the refresh button once the user is finished scrolling

---

To implement the first part (1.1., and 1.2.):

-(void)startReloading:(id)sender
{
    ...
    self.tableView.userInteractionEnabled = NO;
    // and the rest of the method implementation
}

-(void)stopReloading:(id)sender
{
    self.tableView.userInteractionEnabled = YES;
    // and the rest of the method implementation
}

To implement the second part (2.1., and 2.2.):

- (void)scrollViewWillBeginDragging:(UIScrollView *)activeScrollView
{
    barButton.enabled = NO;
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    barButton.enabled = YES;
}

And as it's explained in the previous answer, UISCrollViewDelegate needs to be set in the .h file:

@interface MyTableViewController : UITableViewController <UIScrollViewDelegate> 

P.S. You can use scrollEnabled instead of userInteractionEnabled, but it all depends on what you're doing, but userInteraction is the preferred option.

Answer 3

To expand on Vladimir's answer, this is how I implemented this solution:

In .h file:

@interface MyViewController : UIViewController <UIScrollViewDelegate> 

In .m file:

- (void)scrollViewWillBeginDragging:(UIScrollView *)activeScrollView {
    //logic here
}

Answer 4

You don't need to subclass UITableView to track scrolling. Your UITableViewDelegate can serve as UIScrollViewDelegate as well. So in your delegate class you can implement -scrollViewWillBeginDragging: or whatever UIScrollViewDelegate method you need in your situation. (as actually suggested in the question you mention)