Display PDF file in Swift 4

Question

import UIKit
import WebKit

class ViewController: UIViewController, UIDocumentInteractionControllerDelegate {

    var docController: UIDocumentInteractionController!

    override func viewDidLoad() {
        super.viewDidLoad()

        docController = UIDocumentInteractionController.init(url: URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(urlVal!))
        docController.delegate = self
        docController.presentPreview(animated: true)       
    }


    func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
            return self
     }
}

Above code I'm not able to display the pdf file. Can anyone help?

Solution

By seeing your code it seems that you missed to add UIDocumentInteractionControllerDelegate delegate method.

    class ViewController: UIViewController,UIDocumentInteractionControllerDelegate {
        override func viewDidLoad() {
            super.viewDidLoad()

           var docController = UIDocumentInteractionController.init(url: URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(urlVal!))
            docController.delegate = self
            docController.presentPreview(animated: true)
        }
        func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
            return self
        }
    }

OR

You can also view PDF by loading it into WKWebView.

    override func viewDidLoad() {
        super.viewDidLoad()

        let pdfFilePath = Bundle.main.url(forResource: "iostutorial", withExtension: "pdf")
        let urlRequest = URLRequest.init(url: pdfFilePath!)
        webView = WKWebView(frame: self.view.frame)
        webView.load(request)
        self.view.addSubview(webView)

    }

Comments

[Abhishek Jain]

Where is your docController defined? I can't see it in the above code.

[GTeckHan Goh]

Hi, i define at the top

[geisterfurz007]

Possible duplicate of Open PDF file using swift

[GTeckHan Goh]

...sorry i miss out to adding here..so sorry.. i got add the func documentInteractionControllerViewControllerForPreview actually

[GTeckHan Goh]

cant assign value of type WKWebView to type UIWebView!

[GTeckHan Goh]

i already doing this but the pdf still cant show..the pdf get from one URL from DB

[Mobile Team iOS-RN]

Yes you can do that by using this code. override func viewDidLoad() { super.viewDidLoad() let pdfFilePath = Bundle.main.url(forResource: "iostutorial", withExtension: "pdf") let urlRequest = URLRequest.init(url: pdfFilePath!) let webView = UIWebView(frame: self.view.frame) webView.loadRequest(urlRequest) self.view.addSubview(webView) }

[GTeckHan Goh]

i hit error Thread1 : EXC_BAD_INSTRUCTION(code=EXC_1386_INVOP, subcode=0x0) at let urlRequest = URLRequest.init(url: pdfFilePath!)

[Mobile Team iOS-RN]

Actually it's working code in my project, All you need to do is just replace your PDF file path.

[GTeckHan Goh]

dunnoe why i hit Thread1 : EXC_BAD_INSTRUCTION(code=EXC_1386_INVOP, subcode=0x0)

[Apparao Mulpuri]

ok. Download the PDF file from the URL and pass the file url path to the DocumentInteractionController.

[GTeckHan Goh]

But..i need to use URL to get the pdf file oh

[Apparao Mulpuri]

right. write the pdf content to a file in your app's Documents folder. Get the file URL from that file.

[GTeckHan Goh]

ya..currently i get from DB the URL

[Apparao Mulpuri]

You have the PDF url but no PDF content. You should download the PDF Content from that URL (URL from DB) and write to the file and pass that file url to DocumentInteractionController.

[GTeckHan Goh]

which mean..inside my program need have the pdf file ?

[GTeckHan Goh]

...if i download the pdf and upload to my project..after that i do if let fileURL = Bundle.main.path(forResource: "myPDF", ofType: "pdf")

[Mobile Team iOS-RN]

Can you share me your pdf url?

[GTeckHan Goh]

finexuscards.com/wp-content/themes/finexuscards/pdf/…

[Apparao Mulpuri]

ok. Check this out on how to download and save the file in iOS app bundle. stackoverflow.com/questions/5323427/…

[Mobile Team iOS-RN]

Using above code i am able to load your PDF, Make sure you enable app transport security key into your plist file.

[GTeckHan Goh]

how to do that ? please guild me

[GTeckHan Goh]

how to do that ? please guild me

[GTeckHan Goh]

Is App Transport Security Setting -> Allow Arbitrary Loads ??

[Mobile Team iOS-RN]

Yes add this key value. <key>NSAppTransportSecurity</key> <dict> <key>NSAllowsArbitraryLoads</key> <true/> </dict>