Swift: UIDocumentInteractionController is not working?

Question

UIDocumentInteractionController is not working with large pdf files with multiple pages.

Here in my code,

      var docController:UIDocumentInteractionController!

...

    DispatchQueue.main.async (execute: { [weak self] in

            self?.docController = UIDocumentInteractionController(url: pdfFileURL!)
            self?.docController.delegate = self
            self?.docController.name = pdfFileURL?.lastPathComponent
            self?.docController.presentPreview(animated: true)
    })

and delegate method,

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

This is the warning in console,

2017-05-26 12:46:51.178894 MyApp [3350:1136818] [default] View service did terminate with error: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted} #Remote

Below attached is the blank image,

Please help me out thanks.

Answer 1

Try Like This:

Declare : var interaction: UIDocumentInteractionController?

Then add

 interaction = UIDocumentInteractionController(url: URL(string: "<PDF FILE PATH>")!)
 interaction.delegate = self
 interaction.presentPreview(animated: true) // IF SHOW DIRECT

OR if need any suggestion popup

interaction.presentOpenInMenu(from: /*<SOURCE BUTTON FRAME>*/, in: self.view, animated: true)

Implement Delegate -> UIDocumentInteractionControllerDelegate

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

public func documentInteractionControllerDidEndPreview(_ controller: UIDocumentInteractionController) {
    interaction = nil
}

Answer 2

Be sure that your file is actually pdf file by checking its extension or if url path contains ".pdf"

Otherwise it will recognize it as text file and will not open it.

Answer 3

I just implemented UIDocumentInteractionController last week and it's working fine.

Do one thing declare as UIDocumentInteractionController as var below to class

then do allocation and initialization in viewDidLoad()as I did

documentInteractionController = UIDocumentInteractionController.init()
documentInteractionController?.delegate = self

and at the time of presenting I make it like this

documentInteractionController?.url = url
documentInteractionController?.presentPreview(animated: true)

Hope it will resolve your problem.