View pdf in swift 4 - swift4

Question

i have tried everything on internet to add a PDFViewer in my app. im working with ios 12. im asking you to help me understand what is the possible ways to add a pdf and a solution that can solve it in a easy way for my low experience with swift coding. thank you

Answer 1

We can use our native UIDocumentInteractionController for the same.
Follow below steps :
Step 1
var documentInteractionController = UIDocumentInteractionController()
Step 2
self.documentInteractionController.delegate = self
Step 3
func openDocument(atURL url: URL, screenTitle: String) {
self.documentInteractionController.url = url
self.documentInteractionController.name = screenTitle
self.documentInteractionController.delegate = self
self.documentInteractionController.presentPreview(animated: true)
}
Step 4 : Implement UIDocumentInteractionControllerDelegate
extension ViewController: UIDocumentInteractionControllerDelegate {
// when a document interaction controller needs a view controller for presenting a document preview.
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
return self.navigationController ?? UIViewController()
}
}
Some helper methods :
a) View Pdf
func viewPdf(urlPath: String, screenTitle: String) {
// open pdf for booking id
guard let url = urlPath.toUrl else {
print("Please pass valid url")
return
}
self.downloadPdf(fileURL: url, screenTitle: screenTitle) { localPdf in
if let url = localPdf {
DispatchQueue.main.sync {
self.openDocument(atURL: url, screenTitle: screenTitle)
}
}
}
}
b) function for download file
// method for download pdf file
func downloadPdf(fileURL: URL, screenTitle: String, complition: #escaping ((URL?) -> Void)) {
// Create destination URL
if let documentsUrl: URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let destinationFileUrl = documentsUrl.appendingPathComponent("\(screenTitle).pdf")
if FileManager.default.fileExists(atPath: destinationFileUrl.path) {
try? FileManager.default.removeItem(at: destinationFileUrl)
}
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url: fileURL)
let task = session.downloadTask(with: request) { tempLocalUrl, response, error in
if let tempLocalUrl = tempLocalUrl, error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Successfully downloaded. Status code: \(statusCode)")
}
do {
try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
complition(destinationFileUrl)
} catch let writeError {
print("Error creating a file \(destinationFileUrl) : \(writeError)")
}
} else {
print("Error took place while downloading a file. Error description: \(error?.localizedDescription ?? "N/A")")
}
}
task.resume()
} else {
complition(nil)
}
}

Answer 2

here I am Downloading PDF and store on in File And Open That file in Quick Look
Here I am sharing screen
enter image description here
Reference link: https://www.hackingwithswift.com/example-code/libraries/how-to-preview-files-using-quick-look-and-qlpreviewcontroller

Answer 3

If you just need to present the PDF, you could use a WebView from WebKit and pass the data using the mimetype application/pdf.
like this:
webView.load(data, mimeType: "application/pdf", characterEncodingName: "UTF-8", baseURL: baseURL)