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谁能帮我理解Document Picker Extension。它如何在应用程序中工作？

我正在按照此处给出的步骤进行操作（请参阅生命周期）

但我的 UIDocumentPickerViewExtensionViewController 子类没有启动

@IBAction func selectImageAction(sender : UIBarButtonItem)
{
    var url = NSURL.fileURLWithPath(NSBundle.mainBundle().pathForResource("2", ofType: "png"))
    var docPicker = UIDocumentMenuViewController(URL: url, inMode: UIDocumentPickerMode.ExportToService)
    docPicker.delegate = self
    docPicker.modalPresentationStyle = UIModalPresentationStyle.Popover;

    self.presentViewController(docPicker, animated: true, completion: nil)
}

func documentMenu(documentMenu: UIDocumentMenuViewController!, didPickDocumentPicker documentPicker: UIDocumentPickerViewController!)
{
/*This method is not loading my UIDocumentPickerViewExtensionViewController subclass
I have set all key value in plist for that*/

    documentPicker.view.backgroundColor = UIColor.clearColor()
    documentPicker.delegate = self
    self.presentViewController(documentPicker, animated: true, completion: nil)
}

我想从我的主机应用程序共享 1 个文件，然后使用iOS 8上的Document Picker Extension在另一个应用程序中使用。

任何处于工作状态的演示都会非常有帮助。

提前致谢。

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