从邮件应用程序分享附件在iOS中的分享扩展

现在我正在开发应用程序，该应用程序应实现共享扩展以从邮件应用程序共享附件。它应该支持不同的文件扩展名（几乎所有类型的文档）。从Apple文档中，我了解到我必须在Info.plist中使用Predicate，但在所有的答案中，我发现我必须在代码中使用它。现在我陷入了困境，无法继续前进。这是我想从此post使用的谓词。从邮件应用程序分享附件在iOS中的分享扩展

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" 
      ) 
)[email protected] == [email protected] 
)[email protected] == 1

谁能告诉我如何在我的SWIFT代码中使用此断言：

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) 
       } 
      } 
     } 
    }

这里是我的NSExtensionActivationRule：

 <key>NSExtensionActivationRule</key> 
     <dict> 
      <key>NSExtensionActivationSupportsAttachmentsWithMaxCount</key> 
      <integer>1</integer> 
     </dict>

在此先感谢。

来源

2016-04-08 Artiom

所以最后我在我的问题上找到了答案！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NSExtensionActivationSupportsAttachmentsWithMaxCount。像：

 <key>NSExtensionActivationRule</key> 
     <string>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" 
      ) 
      )[email protected] == 1 // Important! to activate extension only on 1 chosen image 
      )[email protected] == 1 
     </string>

二：正确使用获得必要TypeIdentifier（UTI）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” - 是普遍的UTI支持所有类型的文件扩展名中列出您的NSExtensionActivationRule字符串。你可以得到必要的UTI https://developer.apple.com

好运与发展的动作扩展！任何问题都欢迎！

来源

2016-05-06 14:08:48 Artiom

generateImageName（）你能解释一下这个函数做什么吗？ –

这是我的功能，它只是从拾取的文件的路径中获取原始文件名。 – Artiom

从邮件应用程序分享附件在iOS中的分享扩展

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