Write UIImage along with metadata (EXIF, GPS, TIFF) in iPhone's Photo library

Question

I am developing a project, where the requirements are: - User will open the camera through the application - Upon capturing an Image, some data will be appended to the captu

Answer 1

There are many frameworks that deals with image and metadata.

Assets Framework is deprecated, and replaced by Photos Library framework. If you implemented AVCapturePhotoCaptureDelegate to capture photos, you can do so:

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    var metadata = photo.metadata
    metadata[kCGImagePropertyGPSDictionary as String] = gpsMetadata
    photoData = photo.fileDataRepresentation(withReplacementMetadata: metadata,
      replacementEmbeddedThumbnailPhotoFormat: photo.embeddedThumbnailPhotoFormat,
      replacementEmbeddedThumbnailPixelBuffer: nil,
      replacementDepthData: photo.depthData)
    ...
}

The metadata is a dictionary of dictionaries, and you have to refer to CGImageProperties.

I wrote about this topic here.