By setting the PKCanvasView background colour to blue, I can inform that the PKCanvasView for every PDFPage is created usually, however it doesn’t reply to the touch. Particularly, whether or not it’s finger or applepencil, all of the responses of the web page happen from PDFView(reminiscent of zoom and scroll), and PKCanvasView can’t draw, please how one can clear up?
struct PDFContentView: UIViewControllerRepresentable {
let file: FileItem
@Binding var selectedPage: Int
@Binding var currentMode: Mode
@Binding var latestPdfChatResponse: LatestPDFChatResponse
@Binding var drawDataList: [DrawDataItem]
@ObservedObject var userMessage: ChatMessage
@EnvironmentObject var userSettings: UserSettings
func makeUIViewController(context: Context) -> PDFAnnotatableViewController {
let controller = PDFAnnotatableViewController(
file: file,
userSettings: userSettings,
drawDataList: $drawDataList,
selectedPage: $selectedPage,
currentMode: $currentMode,
latestPdfChatResponse: $latestPdfChatResponse,
userMessage: userMessage
)
return controller
}
func updateUIViewController(_ uiViewController: PDFAnnotatableViewController, context: Context) {
uiViewController.goToPage(selectedPage: selectedPage-1)
uiViewController.togglecurrentMode(currentMode: currentMode)
}
}
class PDFAnnotatableViewController: UIViewController, PDFViewDelegate {
personal let pdfView = PDFView()
personal var pdfDocument: PDFDocument?
let file: FileItem
personal var userSettings: UserSettings
@Binding var selectedPage: Int
@Binding var currentMode: Mode
@Binding var latestPdfChatResponse: LatestPDFChatResponse
@State personal var pdfPageCoordinator = PDFPageCoordinator()
@ObservedObject var userMessage: ChatMessage
init(file: FileItem,
userSettings: UserSettings,
drawDataList: Binding<[DrawDataItem]>,
selectedPage: Binding,
currentMode: Binding,
latestPdfChatResponse: Binding,
userMessage: ChatMessage) {
self.file = file
self.userSettings = userSettings
self._selectedPage = selectedPage
self._currentMode = currentMode
self._latestPdfChatResponse = latestPdfChatResponse
self.userMessage = userMessage
tremendous.init(nibName: nil, bundle: nil)
DispatchQueue.world(qos: .userInitiated).async {
if let doc = PDFDocument(url: file.pdfLocalUrl) {
DispatchQueue.predominant.async {
self.pdfDocument = doc
self.pdfView.doc = doc
self.goToPage(selectedPage: selectedPage.wrappedValue - 1)
}
} else {
print("❌ PDF 文档加载失败")
}
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been carried out")
}
override func viewDidLoad() {
tremendous.viewDidLoad()
setupPDFView()
}
// MARK: - PDF
personal func setupPDFView() {
pdfView.delegate = self
pdfView.autoScales = true
pdfView.displayMode = .singlePage
pdfView.displayDirection = .vertical
pdfView.backgroundColor = .white
pdfView.usePageViewController(true)
pdfView.displaysPageBreaks = false
pdfView.displaysAsBook = false
pdfView.minScaleFactor = 0.8
pdfView.maxScaleFactor = 3.5
pdfView.pageOverlayViewProvider = pdfPageCoordinator
if let doc = pdfDocument {
pdfView.doc = doc
goToPage(selectedPage: selectedPage)
}
pdfView.body = view.bounds
pdfView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(pdfView)
NotificationCenter.default.addObserver(
self,
selector: #selector(handlePageChange),
identify: .PDFViewPageChanged,
object: pdfView
)
}
// Coping with web page turning
@objc personal func handlePageChange(notification: Notification) {
guard let currentPage = pdfView.currentPage, let doc = pdfView.doc else { return }
let currentPageIndex = doc.index(for: currentPage)
if currentPageIndex != selectedPage - 1 {
DispatchQueue.predominant.async {
self.selectedPage = currentPageIndex + 1
}
}
}
func goToPage(selectedPage: Int) {
guard let doc = pdfView.doc else { return }
if let web page = doc.web page(at: selectedPage) {
pdfView.go(to: web page)
}
}
// Change operate
func togglecurrentMode(currentMode: Mode){
DispatchQueue.predominant.async {
if self.currentMode == .none{
self.pdfView.usePageViewController(true)
self.pdfView.isUserInteractionEnabled = true
} else if self.currentMode == .annotation {
if let web page = self.pdfView.currentPage {
if let canvasView = self.pdfPageCoordinator.getCanvasView(forPage: web page) {
canvasView.isUserInteractionEnabled = true
canvasView.instrument = PKInkingTool(.pen, colour: .crimson, width: 20) // 设置绘画工具
canvasView.drawingPolicy = .anyInput // 支持所有输入，包括 Apple Pencil
canvasView.setNeedsDisplay()
}
}
}
}
}
}
class MyPDFPage: PDFPage {
var drawing: PKDrawing?
func setDrawing(_ drawing: PKDrawing) {
self.drawing = drawing
}
func getDrawing() -> PKDrawing? {
return self.drawing
}
}
class PDFPageCoordinator: NSObject, PDFPageOverlayViewProvider {
var pageToViewMapping = [PDFPage: PKCanvasView]()
func pdfView(_ view: PDFView, overlayViewFor web page: PDFPage) -> UIView? {
var resultView: PKCanvasView? = nil
if let overlayView = pageToViewMapping[page] {
resultView = overlayView
} else {
let canvasView = PKCanvasView(body: view.bounds)
canvasView.drawingPolicy = .anyInput
canvasView.instrument = PKInkingTool(.pen, colour: .systemYellow, width: 20)
canvasView.backgroundColor = .blue
pageToViewMapping[page] = canvasView
resultView = canvasView
}
if let web page = web page as? MyPDFPage, let drawing = web page.drawing {
resultView?.drawing = drawing
}
return resultView
}
func pdfView(_ pdfView: PDFView, willEndDisplayingOverlayView overlayView: UIView, for web page: PDFPage) {
guard let overlayView = overlayView as? PKCanvasView, let web page = web page as? MyPDFPage else { return }
web page.drawing = overlayView.drawing
pageToViewMapping.removeValue(forKey: web page)
}
func savePDFDocument(_ pdfDocument: PDFDocument) -> Knowledge {
for i in 0.. PKCanvasView? {
return pageToViewMapping[page]
}
}
Is there an error in my code? Please inform me how one can make PKCanvasView portray usually?