Get user profile details (especially email address) from Twitter in iOS

I am aiming to get a user's details based on his/her Twitter account. Now first of all, let me explain what I want to do.

In my case, user will be presented an option to Sign-up with Twitter account. So, based on user's Twitter account, I want to be able to get user details (e.g. email-id, name, profile picture, birth date, gender etc..) and save those details in database. Now, many people will probably suggest me to use ACAccount and ACAccountStore, a class that provides an interface for accessing, manipulating, and storing accounts. But in my case, I want to sign up user, even if user has not configured an account for Twitter in iOS Settings App. I want user to navigate to login screen of Twitter (in Safari or in App itself, or using any other alternative).

I have also referred the documentation of Twitter having API list here. But I am a lot confused how user should be presented a login screen to log into the Twitter account and how I will get profile information. Should I use UIWebView, or redirect user to Safari or adopt another way for that ?

Twitter has provided a beautiful framework for that, you just have to integrate it in your app.

https://dev.twitter.com/twitter-kit/ios

It has a simple Login Method:-

// Objective-C
TWTRLogInButton* logInButton =  [TWTRLogInButton
                                     buttonWithLogInCompletion:
                                     ^(TWTRSession* session, NSError* error) {
    if (session) {
         NSLog(@"signed in as %@", [session userName]);
    } else {
         NSLog(@"error: %@", [error localizedDescription]);
    }
}];
logInButton.center = self.view.center;
[self.view addSubview:logInButton];

This is the process to get user profile information:-

/* Get user info */
        [[[Twitter sharedInstance] APIClient] loadUserWithID:[session userID]
                                                  completion:^(TWTRUser *user,
                                                               NSError *error)
        {
            // handle the response or error
            if (![error isEqual:nil]) {
                NSLog(@"Twitter info   -> user = %@ ",user);
                NSString *urlString = [[NSString alloc]initWithString:user.profileImageLargeURL];
                NSURL *url = [[NSURL alloc]initWithString:urlString];
                NSData *pullTwitterPP = [[NSData alloc]initWithContentsOfURL:url];

                UIImage *profImage = [UIImage imageWithData:pullTwitterPP];


            } else {
                NSLog(@"Twitter error getting profile : %@", [error localizedDescription]);
            }
        }];

I think rest you can find from Twitter Kit Tutorial, it also allows to request a user’s email, by calling the TwitterAuthClient#requestEmail method, passing in a valid TwitterSession and Callback.