小编GTe*_*Goh的帖子

-UIApplication.shared.openURL(url)
-UIApplicartion.shared.open(url,options: [:],completionHandler: nil)

我可以在iOS9和iOS10中使用这两个选项吗？

UIApplication.shared.openURL(url)iOS9和/或iOS10 是否受支持？

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
     }
}

上面的代码我无法显示pdf文件。有人可以帮忙吗？