ios - CoreGraphics PDF 记录了一个错误。设置环境变量 "CG_PDF_VERBOSE"以了解更多信息

Question

我正在尝试将 iOS PDFKit 嵌入到我的 Flutter 应用程序中。以下是我的代码

public class PDFCustomView: NSObject, FlutterPlatformView {

    let frame: CGRect
    let viewId: Int64

    init(_ frame: CGRect,viewId: Int64, args: Any?){
        self.frame = frame
        self.viewId = viewId
    }

    public func view() -> UIView {
        let pdfView = PDFView(frame: frame)
        if let path = Bundle.main.path(forResource: "studenthandbook2018", ofType: "pdf") {
            let url = URL(fileURLWithPath: path)
            if let pdfDocument = PDFDocument(url: url) {
                pdfView.displayMode = .singlePageContinuous
                pdfView.autoScales = true
                pdfView.document = pdfDocument
            }
        }
        return PDFView()
    }

}

public class PdfViewFactory: NSObject, FlutterPlatformViewFactory {
    public func create(withFrame frame: CGRect, viewIdentifier viewId: Int64, arguments args: Any?)
        -> FlutterPlatformView {
        return PDFCustomView(frame,viewId: viewId,args: args)
    }
}

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)

    let viewFactory = PdfViewFactory()
    registrar(forPlugin: "iospdf").register(viewFactory, withId: "PDFIOSView")

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

我还包括了

<key>io.flutter.embedded_views_preview</key>
    <true/>

在 info.plist 中

我没有返回 PDFView，而是尝试返回 UISLider，它在我的应用程序中正常工作，但 PDFkit 给出错误提示 CoreGraphics PDF 已记录错误。设置环境变量“CG_PDF_VERBOSE”以了解更多信息。

这是 Flutter 错误还是我做错了什么？

Answer 1

第 1 步:如图所示编辑方案

第 2 步:添加一个新的环境变量，如下所示:

第 3 步:查看 XCode 日志中显示的错误。就我而言，它正在打印

missing or invalid CIDToGIDMap entry.

快速搜索表明我正在使用的 pdf 文件可能缺少一些嵌入的字体。