电子邮件jpg在应用程序中创建，包括元数 [英] Email jpg created in app including metadata

问题描述

我已成功添加元数据到应用程序内创建的jpg，并使用

I have successfully added metadata to a jpg created within the app and saved it to the Camera Roll using the

writeImageToSavedPhotosAlbum: metadata: completionBlock: 

方法。不过我也希望通过电子邮件发送这个jpg与元数据（如位置，退出等）。我使用这个电子邮件：

method. However I would also like the option of emailing this jpg with the metadata (such as location, exit, etc.). I use this to email:

MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
NSData *myData =  UIImageJPEGRepresentation(emailImage, 0.8);
[picker addAttachmentData:myData mimeType:@"image/jpg" fileName:@"photo"];

但是，这不会导致元数据。

发送保存的图像时通过苹果的照片应用程序，包含元数据 。
有没有办法将元数据嵌入到NSData附件中？任何想法？

However, this results in no metadata.
When the saved image is sent via Apple's photo app, metadata is included. Is there a way to embed the metadata into NSData attachment? Any ideas?

推荐答案

UIImage不持有任何元数据。如果您有图像的路径直接从它读取数据。如果从相机胶卷中获取图像，那么UIImagePickerDelegate中还包含信息字典中的元数据的 imagePickerController：didFinishPickingMediaWithInfo：方法。

UIImage doesn't hold any metadata. If you have the path for the image read data directly from it. If you get the image back from camera roll there's the imagePickerController:didFinishPickingMediaWithInfo: method from UIImagePickerDelegate which also contains the metadata inside the info dictionary.

此外，mimeType应为image / jpeg。

Also the mimeType should be "image/jpeg".

编辑：
要添加元数据到 UIImage ，您可以使用ImageIO框架：您可以从UIImage创建一个 CGImageDestination 对象，使用 CGImageDestinationSetProperties 然后从中获取原始数据（包括压缩图像和元数据）

To add metadata to a UIImage you can use the ImageIO framework: You can create a CGImageDestination object from a UIImage, add metadata to it using CGImageDestinationSetProperties and then get the raw data (which includes the compressed image and the metadata) from it

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