pdf save-show-share

func savePdf(urlString:String, fileName:String) {
        DispatchQueue.main.async {
            let url = URL(string: urlString)
            let pdfData = try? Data.init(contentsOf: url!)

            let resourceDocPath = URL(fileURLWithPath: NSTemporaryDirectory())
            let pdfNameFromUrl = "YourAppName-\(fileName).pdf"
            let actualPath = resourceDocPath.appendingPathComponent(pdfNameFromUrl)
            do {
                try pdfData?.write(to: actualPath, options: .atomic)
                let activityController = UIActivityViewController(activityItems: [actualPath], applicationActivities: nil)
                DispatchQueue.main.async {
                    self.showActivity(activity: activityController)
                }

                print("pdf successfully saved!")
            } catch {
                print("Pdf could not be saved")
            }
        }
    }

    func showSavedPdf(url:String, fileName:String) {
        if #available(iOS 10.0, *) {
            do {
                let docURL = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
                let contents = try FileManager.default.contentsOfDirectory(at: docURL, includingPropertiesForKeys: [.fileResourceTypeKey], options: .skipsHiddenFiles)
                for url in contents {
                    if url.description.contains("\(fileName).pdf") {
                        // its your file! do what you want with it!

                    }
                }
            } catch {
                print("could not locate pdf file !!!!!!!")
            }
        }
    }

    // check to avoid saving a file multiple times
    func pdfFileAlreadySaved(url:String, fileName:String)-> Bool {
        var status = false
        if #available(iOS 10.0, *) {
            do {
                let docURL = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
                let contents = try FileManager.default.contentsOfDirectory(at: docURL, includingPropertiesForKeys: [.fileResourceTypeKey], options: .skipsHiddenFiles)
                for url in contents {
                    if url.description.contains("YourAppName-\(fileName).pdf") {
                        status = true
                    }
                }
            } catch {
                print("could not locate pdf file !!!!!!!")
            }
        }
        return status
    }