Detect TableView and CollectionView scrolling in same controller

Question

I have CollectionView and TableView in a controller . I have made a segment control by CollectionView and implements scrollView delegate in controller like below :-

class MyViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UICollectionViewDelegate,UICollectionViewDataSource,UIScrollViewDelegate,UICollectionViewDelegateFlowLayout

I have implements scrollViewDidEndDecelerating, Now i want to detect which component scrolling (tableView or collectionView)

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView)
    {
         //here i want to detect which component scrolling(tableView or collectionView)

        if scrollView.contentOffset.x == 0
        {
            segmentControl.selectedSegmentIndex = 0
            DispatchQueue.main.async{
                self.colView.reloadData()
            }
        }
        else if scrollView.contentOffset.x == view.frame.size.width
        {
            DispatchQueue.main.async{
                self.colView.reloadData()
            }
            segmentControl.selectedSegmentIndex = 1
        }
        DispatchQueue.main.async{

                let segAttributes: NSDictionary = [
                    NSForegroundColorAttributeName: UIColor.white,
                    NSFontAttributeName: UIFont.systemFont(ofSize: 12)
                ]
                let segAttributes1: NSDictionary = [
                    NSForegroundColorAttributeName: UIColor.init(red: 247.0/255.0, green: 105.0/255.0, blue: 8.0/255.0, alpha: 1),
                    NSFontAttributeName: UIFont.systemFont(ofSize: 12)
                ]


                self.segmentControl.setTitleTextAttributes(segAttributes1 as [NSObject : AnyObject], for: UIControlState.selected)
                self.segmentControl.setTitleTextAttributes(segAttributes as [NSObject : AnyObject], for: UIControlState.normal)
                self.tblVIewAmenities.reloadData()
                self.tblViewRoomDetails.reloadData()
            }

        }

    }

Answer 1

Since UICollectionView and UITableView inherit from UIScrollView you can use an if let to attempt to cast the UIScrollView to either, which will then reveal which it is:

extension ViewController: UIScrollViewDelegate {
  func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    if let _ = scrollView as? UITableView {
      print("tableview")
    } else if let _ = scrollView as? UICollectionView {
      print("collectionview")
    }
  }
}

Alternatively, if you have properties stored for the UITableView and UICollectionView, you could use an equality check on the scrollView passed to scrollViewDidEndDecelerating(_:) to determine which is which:

class ViewController: UIViewController {

    @IBOutlet weak var collectionView: UICollectionView!
    @IBOutlet weak var tableView: UITableView!
}

extension ViewController: UIScrollViewDelegate {
  func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    if scrollView == tableView {
      print("tableview")
    } else if scrollView == collectionView {
      print("collectionview")
    }
  }
}