我如何使用Facebook访问令牌？

Question

I set up Facebook login with my swift, php, mysql ios app and am storing basic user info in NSUserdefaults, so I can check whether the user is logged in or not. But when reading the Facebook docs, I came across the Facebook token to check if the user is logged in. Would I/should I use this. I assume not since when the user signs in through Facebook I would take the same route as regular sign in and just store the Facebook info in NSUserDefaults and just authorize through that.

Answer 1

Access token is for authentication

Access token is required for getting further info of the user. In few cases if your application contains both login login via Email of login via Facebook you need token. like below you get data:

if((FBSDKAccessToken.current()) != nil){
                    FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, email, picture.width(180).height(180)"]).start(completionHandler: { (connection, result, error) -> Void in
                        if (error == nil){
                            self.fbAccesstoken = FBSDKAccessToken.current().tokenString //save your access token and in result object you get "id,name, first_name, last_name, email, picture (180*180)"
                            completion(result as AnyObject,nil)
                        }
                    })
                }