How I can use Facebook login for login my app in iPhone?

You need to create Bool method which get Facebook loggin is done or Not,u have to setup this function first view,if login is not done then show alert box this link can solve your problem application login with facebook login.

There are the facebook delegate methods for login and logout. First call login method at the start of application You can set BOOL variable to check if user logged in or not and based on that you can give the access to the user.

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