uiviewcontrollerrepresentable.swift

extension CollectionView { 
 func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    func makeUIViewController(context: Context) -> CollectionViewController<Section, Item> {
        print("CollectionView.make()")
        
        let controller = CollectionViewController<Section, Item>()
        controller.layout = layout
        controller.content = content
        controller.supplementaryKinds = supplementaryKinds
        controller.supplementaryContent = supplementaryContent
      
        controller.snapshot = snapshotForCurrentState()
      
         controller.delegate = context.coordinator
        
        return controller
    }
    
    func updateUIViewController(_ controller: CollectionViewController<Section, Item>, context: Context) {
        print("CollectionView.update()")
        
        context.coordinator.dataSource = controller.dataSource
        controller.collectionView.delegate = context.coordinator
        
        let animating = self.animateChanges ?? smallItemsCount()
        
        controller.snapshot = snapshotForCurrentState()
        controller.reloadDataSource(animating: animating)
        
    }
  }