1. Initialize PTPDFNet before you use any PDFTron related methods and classes. This only needs to be done once.

   The best practice to do this is to use the optional application:willFinishLaunchingWithOptions: method in the AppDelegate class found in either the AppDelegate.swift or AppDelegate.m file in the left pane depending on your choice of language:

   // In AppDelegate.swift
   import UIKit
   import PDFNet
   @UIApplicationMain
   class AppDelegate: UIResponder, UIApplicationDelegate {
       var window: UIWindow?
       //... Any methods already here
       func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey: Any]?) -> Bool {
           PTPDFNet.initialize("Insert Commercial License Key Here After Purchase")
           return true
       }
   }

2. 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

3. 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)
       // 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)
   }

4. 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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