hide facebook authorization dialog iPhone

I have a program that authorize on facebook with cookies. So the modal dialog with facebook authorizing every time displaying. I want 开发者_C百科to hide it from user. Any help please..

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When your login was successful you could do something like:

[[NSUserDefaults standardUserDefaults] setObject:_facebook.accessToken forKey:@"FBAccessToken"];
[[NSUserDefaults standardUserDefaults] setObject:_facebook.expirationDate forKey:@"FBExpirationDate"];
[[NSUserDefaults standardUserDefaults] synchronize];

then when your application starts up, do something similar to this:

    if ( [[NSUserDefaults standardUserDefaults] objectForKey:@"FBAccessToken"] != nil ) {
        _facebook.accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:@"FBAccessToken"];
        _facebook.expirationDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"FBExpirationDate"];
    }

What this is doing is, that it saves the "cookie" of the facebook authentication and reuses it when the application is restarted.

Hope this helps.