Access metadata (exif tags) of image taken by UIImagePickerController - iOS/iPhone

Question

Is it possible to access the metadata of an image captured by UIImagePickerController in iOS? I understand this can be done with AssetLibrary framework for images captured by the camera application (or otherwise present in the iPhone photo library), but can a developer access any of the metadata/exif info from within an application right after a user has taken a picture? I'm looking for any type of camera exposure-level info from an image after it has been taken. Thanks!

Answer 1

Apparently, you can access the metadata of an image right after it has been taken. The protocol method that is called by the system after an image has been selected is:

• (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

The NSDictionary argument, info, contains a key: UIImagePickerControllerMediaMetadata

Now if I can figure out how to get the exif tags or any exposure-level information from this to infer basic information about light-level I will be happy. :)