3

现在我正在开发应该实现共享扩展以从邮件应用程序共享附件的应用程序。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 SO 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

谁能建议如何在我的快速代码中使用这个谓词：

    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：

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

提前致谢。

4

1 回答 1

3

So finally I found an answer on my question! Just in case if somebody will meet the same problem.. First of all I have to use PREDICATE statement (Subquery) in Info.plist instead of key NSExtensionActivationSupportsAttachmentsWithMaxCount. Like:

        <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"
            )
            ).@count == 1   // Important! to activate extension only on 1 chosen image
            ).@count == 1
        </string>

Second: Properly get all attachments using necessary TypeIdentifier (UTI):

    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" - is universal UTI to support all kind of file extensions listed in your NSExtensionActivationRule string. You can get necessary UTI on https://developer.apple.com

Good Luck with developing of action extensions! Any questions are welcome!

于 2016-05-06T14:08:48.690 回答