OAuth 2.0 to Access Google APIs?

Is there any tutorial or maybe a library that would let user to login to my app using google both on IOS and Android devices. I guess there needs to be an implementation OAuth 2.0… Maybe there are libraries already made to handle that stuff?

I found that: https://gumroad.com/l/DNyog

It’s only 1$, if i don’t find anything else i will try it. 

I found that: https://gumroad.com/l/DNyog

It’s only 1$, if i don’t find anything else i will try it.