Swift：UIDocumentInteractionController 不起作用？

Question

UIDocumentInteractionController 不适用于具有多个页面的大型 pdf 文件。

在我的代码中，

      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)
    })

和委托方法，

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

这是控制台中的警告，

2017-05-26 12：46：51.178894 MyApp [3350：1136818] [默认]查看服务确实终止并出现错误：错误域=_UIViewServiceInterfaceErrorDomain代码= 3“（null）”UserInfo = {Message =服务连接中断}#Remote

下面附上空白图片，

请帮帮我谢谢。

Answer 1

(1) 此问题通常发生在模拟器中。在真实设备上检查一下。

如果不是这样的话

(2) 试试这个，

class ViewController: UIViewController, UIDocumentInteractionControllerDelegate {

    var docController:UIDocumentInteractionController!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        if let fileURL = NSBundle.mainBundle().pathForResource("SamplePDF1", ofType: "pdf") { // Use if let to unwrap to fileURL variable if file exists
            docController = UIDocumentInteractionController(URL: NSURL(fileURLWithPath: fileURL))

            docController.name = NSURL(fileURLWithPath: fileURL).lastPathComponent

            docController.delegate = self

            docController.presentPreviewAnimated(true)
        }


    }

    func documentInteractionControllerViewControllerForPreview(controller: UIDocumentInteractionController) -> UIViewController {
        return self
    }
     func documentInteractionControllerDidEndPreview(controller: UIDocumentInteractionController) {
        docController = nil
    }