How to set ringtone in iOS Programatically in iOS 8 and later

Hi
We are making an app where the user can set the ringtone by our app. So please let me know how to set a ringtone for particular user programmatically.

I have googled and found that in iOS it is not possible in any case even it is possible then Apple will reject the app.

I found these all answeres here

Set ringtone in iPhone SDK

How to set music file as call tone and message tone in iphone programatically

https://www.google.co.in/search?q=can+we+set+ringtone+programatically+ios&oq=can+we+set+ringtone+programatically+ios+&aqs=chrome..69i57.23214j0j1&sourceid=chrome&ie=UTF-8#q=can+we+set+ringtone+programmatically+ios&newwindow=1&start=10

But these all queries/answers were 2-4 years old. Is it now possible to do this? Please let me know.
Thanks
Gopal Devra