Login Via Twitter - objective-c

It has been almost a month and I couldn't figure this out.
I am developing a social network application and I want the users to be able to log in via their Twitter and Facebook account Like the screenshot below:
The Facebook is done, and I am stock with the twitter, Note that these pictures are actually set as a buttons.
What I want exactly is:
The user can be able to login (sign up) on the application using their Twitter and I will retrieve the basic information from Twitter API "Name,Username,Profile picture" in my application and store them in my database.
Note: I am using Parse and I already have a table call user.
Please help me :'(

It sounds like you haven't tried anything with Twitter yet.
If this were my code, I'd probably use the Twitter API to login, which they introduce you to here.
Or you can use one of the handy Objective-C libraries they've listed here

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