检测同一控制器中的TableView和CollectionView滚动

Question

我CollectionView和TableView一个控制器.我已经制作了一个segment controlby CollectionView和实现scrollView 委托,controller如下所示: -

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

我有工具scrollViewDidEndDecelerating,现在我想检测哪个组件滚动(tableView或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

既然UICollectionView和UITableView继承UIScrollView你可以使用an if let来尝试将其转换UIScrollView为任何一个,然后将显示它是什么:

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

或者,如果您为UITableView和存储了属性,则UICollectionView可以对scrollView传递的to 使用相等性检查scrollViewDidEndDecelerating(_:)来确定哪个是:

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")
    }
  }
}