Swift：UIDocumentInteractionController不工作？

Question

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

在我的代码

这里，

 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 
} 

这是在操作台的警告，

2017-05-26 12:46:51.178894 MyApp [3350:1136818] [default] View service did terminate with error: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted} #Remote

下面连接的是空白图像，

请帮我谢谢。

Answer 1

（1）此问题通常发生在模拟器中。在真实设备上检查它。

如果情况并非如此

（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 
    } 

Answer 2

尝试这样的：

声明：本var interaction: UIDocumentInteractionController?

然后加入

interaction = UIDocumentInteractionController(url: URL(string: "<PDF FILE PATH>")!) 
interaction.delegate = self 
interaction.presentPreview(animated: true) // IF SHOW DIRECT 

，或者如果需要任何建议弹出

interaction.presentOpenInMenu(from: /*<SOURCE BUTTON FRAME>*/, in: self.view, animated: true) 

实现委托 - 与此>UIDocumentInteractionControllerDelegate

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

public func documentInteractionControllerDidEndPreview(_ controller: UIDocumentInteractionController) { 
    interaction = nil 
}