Swift - Getting PDF data working in Simulator but not on a real iPhone

Question

I have a really simple app with a button that opens the files app and prints the content of a PDF in the console. This perfectly works on the simulator, but when using the app in a real iOS device, the app won't print anything.

import PDFKit

 @State var openFile = false

  Button(action:{
                openFile.toggle()
            }){
                
                Image(systemName: "exclamationmark.circle.fill")
            }
        }
        .fileImporter(isPresented: $openFile,
                      allowedContentTypes: [.pdf],
                      onCompletion: {result in
                        if let fileURL = try? result.get() {
                            print(fileURL)
                            if let pdf = PDFDocument(url: fileURL) {
                                print(pdf)
                                let pageCount = pdf.pageCount
                                print(pdf.pageCount)
                                let documentContent = NSMutableAttributedString()

                                for i in 0 ..< pageCount {
                                    guard let page = pdf.page(at: i) else { continue }
                                    guard let pageContent = page.attributedString else { continue }
                                    documentContent.append(pageContent)
                                }
                               
                                print(documentContent.string)
                            }
                            
                        }
                      })

In the Info.plist I already added the Keys Supports opening documents in place and Application supports iTunes file sharing, but I just can't find anything to make it work in a real device.

Thanks in advance for your support!

Answer 1

Found the answer!

Changed the if let to guard let Added fileURL.startAccessingSecurityScopedResource() and fileURL.stopAccessingSecurityScopedResource()

 Button(action:{
                openFile.toggle()

                
            }){
                
                Image(systemName: "exclamationmark.circle.fill")
            }
        }.fileImporter(
            isPresented: $openFile,
            allowedContentTypes: [.pdf],
            allowsMultipleSelection: false
        ) { result in
            do {

                guard let fileURL: URL = try result.get().first else { return print("error fileURL") }
                fileURL.startAccessingSecurityScopedResource()
                guard let pdf = PDFDocument.init(url: fileURL) else {return print("error pdf")}
                let pageCount = pdf.pageCount
                let documentContent = NSMutableAttributedString()
                
                for i in 0..<pageCount {
                    guard let page = pdf.page(at: i) else { continue }
                    guard let pageContent = page.attributedString else { continue }
                    documentContent.append(pageContent)
                }
                fileURL.stopAccessingSecurityScopedResource()
                print(documentContent.string)
               
            } catch {
                print(error)
            }
        }