Pencilkitでpdfに描画

import SwiftUI
import PDFKit
import PencilKit
import UniformTypeIdentifiers

struct PDFViewContainer: UIViewRepresentable {
    @Binding var pdfDocument: PDFDocument?

    func makeUIView(context: Context) -> PDFView {
        let pdfView = PDFView()
        //pdfの拡大率を調整
        pdfView.autoScales = true
        //表示モード
        pdfView.displayMode = .singlePage
        return pdfView
    }

    func updateUIView(_ uiView: PDFView, context: Context) {
        uiView.document = pdfDocument
    }
}


struct PKCanvasViewRepresentable: UIViewRepresentable {
    @Binding var drawing: PKDrawing
    @Binding var selectedTool: PKTool
    @Binding var toolPickerVisible: Bool
    
    var pkcView: PKCanvasView
    //let pkcView = PKCanvasView()
    typealias UIViewType = PKCanvasView
    let toolPicker = PKToolPicker()
    
    func makeUIView(context: Context) -> PKCanvasView {
        configureCanvasView(pkcView)
        return pkcView
    }
    
    func updateUIView(_ uiView: PKCanvasView, context: Context) {
        //uiView.drawing = drawing
        //configureCanvasView(uiView)
    }
    
    func configureCanvasView(_ canvasView: PKCanvasView) {
        canvasView.drawingPolicy = PKCanvasViewDrawingPolicy.anyInput
        //canvasView.tool = selectedTool
        toolPicker.addObserver(canvasView) //変化を検知
        toolPicker.setVisible(true, forFirstResponder: canvasView) //表示
        canvasView.becomeFirstResponder() //変化を適応させる
                if !toolPickerVisible {
                    // ツールピッカーが非表示の場合、手書き内容を設定
                    canvasView.becomeFirstResponder()
                }
        canvasView.isOpaque = false
    }
}

struct ContentView: View {
    @State private var pdfDocument: PDFDocument?
    @State private var isDocumentPickerPresented = false
    @State private var drawing = PKDrawing()
    @State private var toolPickerVisible = false
    @State private var selectedTool: PKTool = PKInkingTool(.pen, color: .red, width: 5)
    @State private var canvasView = PKCanvasView()

    var body: some View {
        
        ZStack {
                    // PDFViewを追加
                    PDFViewContainer(pdfDocument: $pdfDocument)
                        .frame(maxWidth: .infinity, maxHeight: .infinity)

                    // PKCanvasViewを重ねて描画する
                    PKCanvasViewRepresentable(drawing: $drawing, selectedTool: $selectedTool, toolPickerVisible: $toolPickerVisible, pkcView: canvasView)
        }

        VStack {
                    Button("PDFファイルを選択") {
                    isDocumentPickerPresented = true
                    }
                    .padding()
                }
        
        .fileImporter(
            isPresented: $isDocumentPickerPresented,
            allowedContentTypes: [UTType.pdf],
            onCompletion: { result in
                switch result {
                case .success(let url):
                    
                    //ファイルへのアクセス許可
                    guard url.startAccessingSecurityScopedResource() else {
                        // Handle the failure here.
                        print("startAccessingSecurityScopedResource error")
                        return
                    }
                    
                    // FileManagerを使用してファイルが存在するか確認
                    let fileManager = FileManager.default
                    if fileManager.fileExists(atPath: url.path) {
                        print("ファイルが存在します: \(url.path)")
                    } else {
                        print("ファイルが存在しません: \(url.path)")
                    }
                    
                    //  PDFDocumentの作成
                    if let document = PDFDocument(url: url) {
                        print("PDFドキュメントが正常に読み込まれました")
                        self.pdfDocument = document
                    } else {
                        let error = NSError(domain: "com.example.PDFApp", code: 1, userInfo: [NSLocalizedDescriptionKey: "PDFドキュメントの読み込みに失敗しました"])
                        print("エラー: \(error.localizedDescription), \(error.localizedFailureReason ?? "")")
                    }
                    url.stopAccessingSecurityScopedResource()
                case .failure(let error):
                    print("ファイル選択時にエラーが発生しました：\(error.localizedDescription)")
                }
            }
        )
    }
}