In the iOS Photos app there is a caption field the user can write to. How can you write to this value from Swift when creating a photo?
I see apps that do this, but there doesn't seem to be any official way to do this using the Photo library through PHAssetCreationRequest or PHAssetResourceCreationOptions or setting EXIF values, I tried settings a bunch of values there including IPTC values but nothing appears in the caption field in the iOS photos app.
There must be some way to do it since I see other apps setting that value somehow after capturing a photo.
In the latest 27 beta SDK you will find a new API that provides this: PHAssetExtendedMetadata
You can use this API to fetch the caption, keywords, and original filename for a PHAsset. For caption and keywords there are functions on PHAssetChangeRequest which let you modify them.
More information here: https://developer.apple.com/documentation/photos/phassetextendedmetadata
