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(几乎所有类型的文件)。从 Apple 文档中我了解到我必须在我的 Info.plist 中使用 Predicate，但是在 SO 的答案中我发现我必须在代码中使用它。现在我坚持这一点，无法继续进行。这是我想从此 post 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 swift 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。

最佳答案

所以我终于找到了问题的答案!以防万一有人遇到同样的问题.. 首先，我必须在 Info.plist 中使用 PREDICATE 语句(子查询)而不是键 NSExtensionActivationSupportsAttachmentsWithMaxCount。喜欢:

        <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>

其次: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

祝 Action 扩展开发顺利!欢迎提问!

关于ios - 使用 iOS 中的共享扩展从邮件应用程序共享附件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36496799/