I’ve already tried to use Facebook login functionality. During the login I got user token and using this token I could identify user. So, Facebook is OK for me.
1) How can I implement login functionality with Twitter? Will I get anything the same like user token on Facebook?
As far as I know, to use twitter API user should be login in twitter in the settings of iPhone. Can I implement anything to enable user to login even he is not yet logged in in the settings of iPhone?
2) After user login I want him to invite his twitter friends to my application. Is it possible to do? And in what ways?
I will be grateful for some code examples.
Please check the link below each and every step is clearly told by Twitter itself.
https://dev.twitter.com/docs/ios
If you still having problem please follow the link
http://www.raywenderlich.com/5519/beginning-twitter-in-ios-5
That contains the code and all steps !
Hope it will help you !