CKDiscoverUserInfosOperation usage - ios

I want to find out whether a certain user is using my swift application. I read here that CKDiscoverUserInfosOperation is made exactly for doing this. Since neither the answer nor Apple's docs provide any information on how to use it and I did not find anything useful anywhere else I am asking for help.
So I'd appreciate anyone being so kind and helping me out here :)

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Settings in iPhone errors

So silly question here but if someone would humor me and lend any advice I would appreciate it SO much. I’ve had some issues since I’ve created my apple account, but one thing I keep noticing specifically that confuses me (my Apple ID once said it can not be changed, now it allows me the option to change my Apple ID and phone/email everything)
I wouldn’t be so concerned with this, but I’ve had reasons for safety/security concerns and then I noticed this. I see many “null” type messages in my data when I view it directly from my device as well. I’m not tech savvy at all so this is all beyond me. Forgive me please if I’m not posting this correctly. I receive error messages from apple when trying to download my data even. I’ve updated and reset my phone before but it doesn’t help. I want to just know this is user error on my end but I’m not finding information to confirm that anywhere I try to look. Thank you so much for anyone who might be able to point me in the right direction.

How often can I call `UIApplication. shared.registerForRemoteNotifications()`

How often can I call UIApplication. shared.registerForRemoteNotifications() in order to retrieve the device token from APNs. Are there any rules or limits stated in the documentation from Apple. Can I call it as often as I wish?
I have tried to look through the documentation my self, but could not find anything useful. If I have overlooked something please accept my apologies, but please paste a link to the documentation that relates to this question.
I will also be interested in other people's experiences.
Thank you very much in advance!

Implementing Google Play Games Services in Swift

Hello fellow developers :)
I have been trying to implement Google Play Games Services in my newest app project, but find myself being completely lost. I find GMS to be quite complicated and therefore need some sort of tutorial to stand a chance.
Unfortunately the official guide on Googles websites (https://developers.google.com/games/services/ios/quickstart) only describes the setup process for Objective-C.
My question is therefore, as ambiguous as is, if anyone knows anything that could help me implement GMS. This includes links to tutorials, code-snippets, personal tips, or anything else that could come in handy.
And yes, I am aware that questions like these are often frowned upon due to their ambiguous nature. What must be understood is that this question is a desperate last attempt before giving up and going with GameCenter instead. I simply have not found the information needed anywhere else.
Thank you! :)
You may need to use a bridging header for this. Check out the following link by gguuss in GitHub: http://github.com/gguuss/gplus-ios-swift.

how to check data usage

Hi take days looking information about this and I have found absolutely nothing, is there app like Onavo using a proxy, but some do not and I need to know how much data I'm consuming at one point to see if it is producing for such a shock, I need a lot of help if they have some information please help. for example:

What is the main purpose of WebExceptionStatus.Success?

I am a bit confused about the purpose of the enum value Success of the WebExceptionStatus enumeration. I did a search and did not find this enumeration being used outside the WebException class. This is very confusing to me. Why would an exception be used to indicate a successful action/state. Am I missing something, or did I not search thouroughly enough? Was it introduced for future functionality?
Please if anyone does know its basic purpose I would be thankfull if s/he shares with us the explanation.
See if this might help.

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