i want to use my iphone to control sk6812 led strip

On the page of the maker that you linked to they have a Support link and a Contact link. Using one of those I'm sure you can get the information you need to buy what you want (hardware and/or software) or to make it yourself if it doesn't yet exist. 
Why do you buy something first and only then ask what it can do? Seems the wrong sequence.

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