1. Open your ViewController file. This is either the ViewController.swift or ViewController.m file in the left pane depending on your choice of language. Import PDFNet and Tools libraries.

   import PDFNet
   import Tools

2. Override the viewDidAppear() method in the ViewController class and then open the DocumentViewController using:

   override func viewDidAppear(_ animated: Bool) {
       // Create a PTDocumentViewController
       let documentController = PTDocumentViewController()
       // The PTDocumentViewController must be in a navigation controller before a document can be opened
       let navigationController = UINavigationController(rootViewController: documentController)
       navigationController.modalPresentationStyle = .fullScreen
       // Open a file from URL.
       let fileURL: URL = URL(string:"https://pdftron.s3.amazonaws.com/downloads/pl/sample.pdf")!
       documentController.openDocument(with: fileURL)
       // Show navigation (and document) controller.
       self.present(navigationController, animated: true, completion: nil)
   }

3. Click on the white play button on the top left of your window to launch the application in the Simulator.

Your app should look like this:

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