Using Combine with debounce to update document model when editing NSAttributedString in view

Using Combine with debounce.swift

// MARK: - Model

struct DocumentData: Codable {
    var title: String
    var blocks: Array<Block>
    
    ...
}

// MARK: - View

struct DocumentView: View {
    @Binding var documentData: DocumentData
    @StateObject private var vm = DocumentViewViewModel()
    
    init(documentData: Binding<DocumentData>) {
        _documentData = documentData
    }
    
    var body: some View {
        VStack {
            TextField("Document Title", text: $documentData.title)
                .multilineTextAlignment(.center)
            TextView(attributedString: $vm.attributedString)
                .onChange(of: vm.blocks, perform:
                            { newValue in
                    print("onChange of attributedString: Update documentData.blocks accordingly")
                    documentData.blocks = newValue
                })
                .onAppear {
                    print("onAppear: Create attributedString from blocks")
                    vm.attributedString = DocumentViewViewModel.attributedStringFromBlocks(documentData.blocks)
                }
            Spacer()
        }
    }
}

struct DocumentView_Preview: PreviewProvider {
    static var previews: some View {
        DocumentView(documentData: .constant(DocumentData.sampleData))
    }
}


// MARK: - ViewModel
import Combine

class DocumentViewViewModel: ObservableObject {
    @Published var blocks = [Block]()
    @Published var attributedString = NSAttributedString(string: "No text so far.")
    
    private var cancellables = Set<AnyCancellable>()
    
    init() {
        $attributedString
            .dropFirst()   // Do we need that?
            .debounce(for: 0.5, scheduler: RunLoop.main)
            .sink(receiveValue: {[weak self] newValue in
                self?.blocks = DocumentViewViewModel.blocksFromAttributedString(newValue)
            })
            .store(in: &cancellables)
    }
    
    static func blocksFromAttributedString(_ attributedString: NSAttributedString) -> [Block] {
        ...
    }
    
    static func attributedStringFromBlocks(_ blocks: [Block]) -> NSAttributedString {
        ...
    }
}