将NSSecureCoding转换为NSData-Xcode-Swift

Question

我有一些代码创建了一个名为"content"的NSSecureCoding变量，我想将该变量转换为NSData，然后将其制作成UIImage或发送到本地服务器。如何正确转换？我希望这是我在iOS应用程序中制作的共享扩展，所以当你在照片上按共享时，它会获取照片内容并将其转换为NSData。这是我的代码：

    inputItem = extensionContext!.inputItems.first as NSExtensionItem
    attachment = inputItem.attachments![0] as NSItemProvider
    if (attachment.hasItemConformingToTypeIdentifier(kUTTypeImage as String)){
        attachment.loadItemForTypeIdentifier(kUTTypeImage as String,
            options: nil,
            completionHandler: {(content, error: NSError!) in
                //insert code to convert "content"(NSSecureCoding) to NSData variable
        })
    }

Answer 1

DispatchQueue.global().async {
    attachment.loadItem(forTypeIdentifier: kUTTypeImage as String, options: nil, completionHandler: { (item, error) in
        if let error = error {
            print(error.localizedDescription)
            return
        }
        var image: UIImage?
        if item is UIImage {
            image = item as? UIImage
        }
        if item is URL {
            let data = try? Data(contentsOf: item as! URL)
            image = UIImage(data: data!)!
        }
        if item is Data {
            image = UIImage(data: item as! Data)!
        }
        if let image = image {
            DispatchQueue.main.async {
                // image here
            }
        }
    })
}

Answer 2

有点晚了，但今天我遇到了这种情况，我就这样解决了，completionHandler:内部

  if let data = content {
        self.imageData = UIImage(data: NSData(contentsOfURL: data as! NSURL)!)                      
  }

imageData是UIImage类型。