What are the available NSSortDescriptors for PHFetchOptions?

I'm working with Apple's sample code for PhotoBrowse.

In the main view controller's viewDidLoad() method we have this code:

let allPhotosOptions = PHFetchOptions()
allPhotosOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]

This code sorts the photos by "creationDate". How do I determine/find the other valid values for these sort descriptors? For example, what if I wanted to sort photos by their file size, last modified date, etc.?

TIA!

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The supported keys are listed in Table 1 on this page: https://developer.apple.com/documentation/photokit/phfetchoptions

There is no file size key, but modificationDate is supported

Copying here for posterity, the current supported keys for predicates or sort descriptors for PHAsset are

SELF, localIdentifier, creationDate, modificationDate, mediaType, mediaSubtypes, duration, pixelWidth, pixelHeight, isFavorite (or isFavorite), isHidden (or isHidden), burstIdentifier
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  • Despite the documentation implying that it's possible, when I try to use localIdentifier as a sort descriptor it doesn't work.

    —
    gerdemb
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