通过iOS中的共享扩展程序从Mail App共享附件

现在我正在开发应该实现共享扩展的应用程序，以便从Mail App共享附件。 它应该支持不同的文件扩展名（几乎所有类型的文档）。 从Apple docs我明白我必须在我的Info.plist中使用Predicate，但在SO的答案中我发现我必须在代码中使用它。 现在我坚持不懈，无法继续前进。 这是我想在这篇文章中使用的谓词。

SUBQUERY ( extensionItems, $extensionItem, SUBQUERY ( $extensionItem.attachments, $attachment, ( ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.adobe.pdf" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.image" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.png" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg-2000" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.tiff" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.compuserve.gif" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.microsoft.bmp" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.microsoft.word.doc" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "org.openxmlformats.wordprocessingml.document" ) ).@count == $extensionItem.attachments.@count ).@count == 1 

任何人都可以建议如何在我的swift代码中使用此谓词：

  for attachment in content.attachments as! [NSItemProvider] { if attachment.hasItemConformingToTypeIdentifier(contentType) { attachment.loadItemForTypeIdentifier(contentType, options: nil) { data, error in if error == nil { let url = data as! NSURL if let fileData = NSData(contentsOfURL: url) { self.selectedFile = NSData(data: fileData) } } else { let alert = UIAlertController(title: "Error", message: "Error loading file", preferredStyle: .Alert) let action = UIAlertAction(title: "Error", style: .Cancel) { _ in self.dismissViewControllerAnimated(true, completion: nil) } alert.addAction(action) self.presentViewController(alert, animated: true, completion: nil) } } } } 

这是我的NSExtensionActivationRule：

  NSExtensionActivationRule  NSExtensionActivationSupportsAttachmentsWithMaxCount 1  

提前致谢。

Answer 1

最后我在问题上找到了答案！ 以防万一有人会遇到同样的问题。首先，我必须在Info.plist中使用PREDICATE语句（子查询）而不是键NSExtensionActivationSupportsAttachmentsWithMaxCount。 喜欢：

  NSExtensionActivationRule SUBQUERY ( extensionItems, $extensionItem, SUBQUERY ( $extensionItem.attachments, $attachment, ( ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.adobe.pdf" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.image" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.plain-text" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.png" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.jpeg-2000" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "public.tiff" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.compuserve.gif" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.microsoft.bmp" || ANY $attachment.registeredTypeIdentifiers UTI-CONFORMS-TO "com.microsoft.word.doc" ) ).@count == 1 // Important! to activate extension only on 1 chosen image ).@count == 1  

第二：使用必要的TypeIdentifier（UTI）正确获取所有附件：

  if let content = extensionContext!.inputItems.first as? NSExtensionItem { if let contents = content.attachments as? [NSItemProvider] { for attachment in contents{ attachment.loadItemForTypeIdentifier("public.item", options: nil) { data, error in let url = data as! NSURL let fileExtension = url.pathExtension as String! let fileName = self.generateImageName() as String if let fileData = NSData(contentsOfURL: url) { self.uploadFile("\(fileName).\(fileExtension)", data: fileData) } } } } } 

“public.item” – 是通用UTI，支持NSExtensionActivationRule字符串中列出的所有类型的文件扩展名。 您可以在https://developer.apple.com上获得必要的UTI

好运与开发动作扩展！ 欢迎任何问题！