Load file PDF local to webview

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // pdf file path
        let urlString = NSBundle.mainBundle().URLForResource("crew", withExtension: "pdf")

        let urlRequest = NSURLRequest(URL: urlString!)
        let webView = UIWebView(frame: self.view.bounds)
        webView.loadRequest(urlRequest)

        self.view.addSubview(webView)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}