prime31. SocialNetwork iOs. Check system account is present

Question

I use SocialNetworkPlugin for iOs by Prime31 (here)
I want to use login to Fb with SystemAccount if present, but when I haven't it on device - I can't login and take Exception code 308.
I have other login logic but I need use it only when I haven't system account.
Can I check system account for Facebook before first login?

upd: If you can write in c# please.

Answer 1

To detect about the system account for the Facebook in ios you can use :

if([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) 
{

//user is already logged in using iOS integrated FB a/c

}
else
{

//user is not logged in

}

And ss per your given link for SocialNetworkPlugin Prime[31] you can use :

// Checks to see if the user is using a version of iOS that supports the Facebook composer and if they have an account setup 

public static bool canUserUseFacebookComposer()