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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/

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