title: How can I disable Collection View but Header left enbled?
body: <p>I need to disallow Collection View selection, but left CV's header enabled?</p>
  <p>Both methods block header. How to enable it?</p>
  <pre><code>CollectionView.isUserInteractionEnabled = false
  </code></pre>
  <p>or</p>
  <pre><code>CollectionView.allowsSelection = false
  </code></pre>
  <p>Here is UICollectionReusableView:</p>
  <pre><code>final class HeaderCollectionReusableView: UICollectionReusableView {
      
      override init(frame: CGRect) {
          super.init(frame: .zero)
          
          addSubView()
          setupLayout()
      }
      
      required init?(coder: NSCoder) {
          fatalError(&quot;init(coder:) has not been implemented&quot;)
      }
      
      static let headerIdentifier = &quot;HeaderCollectionReusableView&quot;
      
      private func addSubView() {
          
          addSubview(collectionView)
      }
      
      public lazy var collectionView: UICollectionView = {
          
          var flowLayout = UICollectionViewFlowLayout()
          flowLayout.scrollDirection = .horizontal
          flowLayout.itemSize = CGSize(width:  UIScreen.main.bounds.size.width / 3.5, height: UIScreen.main.bounds.size.width / 3)
          flowLayout.minimumLineSpacing = 12
          flowLayout.sectionInset = UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)
          var view = UICollectionView(frame: .zero, collectionViewLayout: flowLayout)
          view.register(cell: CollectionViewCell.self)
          view.backgroundColor = .clear
          view.showsHorizontalScrollIndicator = false
          view.showsVerticalScrollIndicator = false
          view.contentInsetAdjustmentBehavior = .automatic
          view.translatesAutoresizingMaskIntoConstraints = false
          return view
      }()
      
      private func setupLayout() {
          
          NSLayoutConstraint.activate([
              collectionView.topAnchor.constraint(equalTo: topAnchor),
              collectionView.leadingAnchor.constraint(equalTo: leadingAnchor),
              collectionView.trailingAnchor.constraint(equalTo: trailingAnchor),
              collectionView.heightAnchor.constraint(equalToConstant: UIScreen.main.bounds.size.width / 3),
          ])
      }
  }
  </code></pre>
  <p>This is horizontal CV embedded in other vertical CV's header.
  I need to disable vertical CV but left enabled horizontal CV in vertical CV' header )</p>