Objective c -set FBSDKAccessToken with an existing access token string
<p>I implemented the Facebook SDK in my app.
The login process works fine. I'm creating in my webserver a long-lived token.
After the process has been finished in my webserver, I'm getting back the extended access token string.</p>

<p>How can I set the global FBSDKAccessToken with the access token string?</p>

<p>I can see that there is a function setCurrentAccessToken but it need to get  FBSDKAccessToken object.</p>