Using AVAsynchronousKeyValueLoading in Swift

Question

I'm curious if there is a Swifty, safe way to use AVAsynchronousKeyValueLoading without having to hard code the keys I'm using. Specifically, I'd like to call loadValuesAsynchronously(forKeys:completionHandler:) with the key "availableMdiaCharacteristicsWithMediaSelectionOptions", but it currently isn't possible to get a String from any kind of KeyPath-based solution. I would love it if there was some kind of way to retrieve the name of a property in such a way that it would be checked at compile time whether the property exists. Is there such an API?

Answer 1

The solution was #keyPath. I for some reason thought that KeyPath had replaced #keyPath in Swift, but #keyPath(AVAsset. availableMediaCharacteristicsWithMediaSelectionOptions) gives the string "availableMediaCharacteristicsWithMediaSelectionOptions" which is exactly what I want.