Logged in using Gmail account from iPhone - iphone

I have an iPhone application, I implement Facebook login on my app, now users can logged in to my app using their FB account. I also want to implement Gmail login to my app, then users can logged in to my app using their Gmail account. Is it possible to implement Gmail login on iPhone app. Any API for Objective-C for Gmail login is available?
Thanks,
VKS

check out the link for google api for objective c client but they don't provide for the login a user from google credentials
http://code.google.com/p/gdata-objectivec-client/

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Invite user to install an iOS App using Facebook sdk without FBWebDialogs

I have an iOS Bussiness app, which used Facebook to login. Now I have access to the friends list. Is there a way to send a request to a Facebook friend (who is currently not using app) to install my App. My app is Bussiness app category not the game.
this site shows all the information that you want:
https://developers.facebook.com/docs/games/invitable-friends/v2.2

iphone development: how to auto facebook login if the facebook app already logged in

In my app users can login by using facebook. I also have Facebook official app in my mobile phone and it is logged in. When I try to login from my app it asks for email and password. Is it possible to auto login if facebook app already logged in? How can I do that? because I know almost all apps use this feature
Have you considered Facebook SDK for iOS? Here is the link: https://developers.facebook.com/ios/

Send test login credentials to Apple Review Team

I am ready to submit my iphone application to Apple Store. In my application , I have my own login functionality (same like website) which is used to access the application. Also I have "Login with Facebook" functionality.
Do I need to send the test login credentials for my own login functionality as well as Facebook login to the Apple Review Team in "Review Notes in metadata" ?
Any help is appreciated. Thanks
You would need to provide them with any login credentials, and you can just return some dummy data from the server, so that the App review team can review the functionality of the entire app.

Connecting to Twitter using xAuth on iPhone and/or OAuth on Web?

I am building a Web site and iPhone app right now. My site and app requires registration.
I have received xAuth permission from Twitter and was going to use this for the iPhone app so that users can connect their Twitter account.
Once they connect their Twitter account, if they log in to the Web, is it possible to make it so their account is still connected?
On the other hand, I am using OAuth verification on the Web. If someone connects their Twitter account on the Web using OAuth, will they still be connected if logging onto the iPhone app?
So basically, I need to make:
User connects account on iPhone app (xAuth) -> User logs in to Web site and is still connected and can post to Twitter from both
User connects on Web (OAuth) -> User logs in to iPhone app and is still connected and can post to Twitter from both
You can do this --- basically once you do the OAuth based login it generate unique Token, so after this data reading is done using Token.
Once you get Token (it can be in Phone/web) use this details between each other so that both of your application can do the rest of operation for the same user without further login.

iPhone app using facebook connect login to authenticate with web server possible?

I'm developing an iPhone app that will need a login system in order for users to post content to a server. I'd really like to use facebook connect for this as it's a very community driven app. Is it possible for me to securely authenticate with the web server without the user having to create a username and password specifically for my app?
One idea I've had is using my app's FBConnect secret key as a password for an HTTPS connection? The app would be able to tell if a user is logged in, and only connect to the server if so. This would also stop any other connections from hackers etc I assume?
Although not just restricted to Facebook, Janrain provide a great solution to login from various openid methods including facebook connect. I believe there is a free product for non-commercial use. There is a demo iPhone app on the app store to show you how it works etc.
http://www.janrain.com/products/engage
Why not just use the Facebook iOS SDK?