How can I build a custom server side api primarily for swift that stores data

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Apple

iOS

Swift

server-side

I am currently creating an app that needs a custom web API that stores the following things: business addresses, reviews, image gallery, some audio links to Soundcloud, Spotify and etc., images and exclusive deals with said businesses. Once written I will deploy this to a server so it is readily available when need be. My main problem is that I can find guides that do this in objective-c but not in swift. I am not sure if I am looking at this problem in the wrong way or its the wrong solution altogether.