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Chain unknown number of requests

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I am making a call to a RESTful service using AlamoFire using paging and I don't know how many pages there will be. After each call I get a result telling me if there is more data. How can I accomplish this using Swift? I have been using completions for my methods so far and when making 1 or 2 REST calls it isn't too bad but I don't know how to do it with with an unknown number of calls. I looked at PromiseKit but I am not sure how I would use that with an unknown number of calls to make.

What is the right way to do this in Swift?

Thank you

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