Twitter Authentication OAuth or XAuth - iphone

I am trying to integrate Twitter into my application. My basic requirement is to have custom login screen and as twitter requires only OAuth. As per Twitter documentation I found these
MGTwitterEngine(Downloaded but its missing entire OAuth library, hence could not compile)
bengottlieb(cannot customize login as it is web based)
XAuthTwitterEngine
XAuthTwitterEngine looks promising but XAuth is disabled by default and need permission from Twitter
So my questions are
1) what type of information I have to provide to Twitter in order to get approval for enabling XAuth
2) if XAuth is not recommended then how do I achieve my basic requirement mentioned about.
i hope my question is valid. Thanks so much.

You can also check out my Twitter client. It was specifically written for 'Share on Twitter' functionality. It uses XAuth.
http://github.com/st3fan/iphone-twitter

For future visitor's, here's the link on twitter request form for enabling XAuth, and some more support options:
https://support.twitter.com/forms/platform

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Authentication — Instagram Basic Display is not an authentication
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app users or log them into your app. If you need an authentication
solution we recommend using Facebook Login instead.
But looking at their API reference I get they provide oauth tokens and authentication flow /scopes.
Their getting started guide also list down steps to setup app. Anyone please explain what I am missing there ? I am looking for social login solution using instagram, thanks.

No OAuth2.0 for Twitter on behalf of users?

It looks that Twitter does not support OAuth2.0 on behalf of users.
I feel it is weird that they does not support because "Application-only" Twitter supports OAuth2.0.
When I looked into the official site, the only value of "grant-type" is "client_credentials".
So, no "authorization_code".
This means Twitter does not provide yet for OAuth2.0 on behalf of users???
You are correct that Twitter does not support OAuth2.0 yet, apart from Application-only authentication. As far as I am aware there is no timeframe for Twitter to fully support OAuth2.0.

Twitter oAuth authentication in iOS

I want to authenticate user using Twitter oAuth framework to get oAuth string and Consumer key. But I don’t want to include the whole framework as Only I want to authenticate user don’t want to share or tweet using oAuth on twitter.
Please help me guys
You can use OAuth.io with the IOS SDK for this purpose.
It works easily for more than 90 providers as Twitter and it's lightweight (~33kb).

iphone/ipad standard twitter oauth module?

I have seen the following in a few different apps so it seems like some kind of public api. Anyone where I can find the code for this? Specifcally the twitter login that appears in the popover:
I think your understanding of OAuth needs to be better… OAuth is a way for users to sign into a service without revealing the credentials to the application. The interface you are seeing is Twitter's OAuth endpoint. I suggest looking into the twitter API for integration help.
If you would like to program your own interface for collecting the users credential, use XAuth instead.

LinkedIn / Twitter / Facebook as OAuth and OpenId use

Firstly I understand OpenId is for authentication and OAuth is for authorisation and unlike other questions on the site I am not asking which should be used for which but whether anyone can advise a solution for my issue.
I want to allow users to login to my site via their LinkedIn/Twitter/Facebook account once logged in say via LinkedIn they could also then authorise their Twitter and Facebook account as a optional login method. This would allow the user to authenticate via any of the three but end up with their user account on my site as the end result.
I also want to use the authorisation they have provided to get basic user details (profile pic/name etc) and post status updates.
I don't want to ask a user to login with their account via openId then have to authorise the same account again via oauth to allow my site to publish to their service feed and have to do this for each of the 3 services.
Any ideas or issues to this issue?
If you are using ASP.NET MVC, DotNetOpenAuth is an excellent solution for supporting OpenID/OAuth sites. StackOverflow is using it, and they are quite picky for the code they use in the site.
The integration if OpenID with DotNetOpenAuth is quite straightforward. I have not tried OAuth, but I don't expect it to be of any less quality.
Unfortunately, Facebook does not support OpenID/OAuth, so you need to use a different solution for it. The one I use is Clarity Consulting's Facebook Developer Toolkit. It works, although I do have certain complaints about the quality of the code; unfortunately I haven't found anything better yet. (Note: If anyone knows a better alternative, by all means let me know)
The basic integration of Facebook Connect with the Facebook Developer Toolkit is also relatively straightforward. However, their object model is somewhat messed up, due to their attempt to stay as close to the Facebook APIs, so the HTTP API patterns are bleeding through a lot. Still, it does the work.
Update: Now that Facebook announced that they'll be supporting OAuth 2.0, DotNetOpenAuth might turn out to be the best solution.
Have you looked into RPX?
https://rpxnow.com/
I don't want to ask a user to login with their account via openId then have to authorise the same account again via oauth to allow my site to publish to their service feed and have to do this for each of the 3 services.
I'm afraid you'll have to connect the user's account to each of the 3 services individually. What platform are you using to build your app? If it's Ruby, then a gem like OmniAuth looks promising.