Using AVAsynchronousKeyValueLoading in Swift
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?
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.
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