快速从JSON数据检索Facebook朋友列表

Question

I am using FBSDK in my Swift iOS application and currently I am trying to retrieve the list of friends who also use my app. I have two-three people who should show up but whenever I search the graphrequest result for friends it returns nil..

let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me",     parameters: nil)
        graphRequest.startWithCompletionHandler({ (connection,     result:AnyObject!, error) -> Void in

            if ((error) != nil)
            {
                // Process error
                println("Error: \(error)")
            }
            else
            {
                //get Facebook ID
                let faceBookID: NSString = result.valueForKey("id") as NSString
                //get username
                let userName : NSString = result.valueForKey("name") as NSString
                //get facebook friends who use app
                let friendlist: AnyObject = result.valueForKey("friends") as AnyObject

            }

I have the "email", "user_friends", and "public_profile" permissions which should be enough to retrieve this information. Any Ideas on what I am doing wrong?? this is doing my head in as my friend doing an android version has successfully got his working..

Answer 1

My problem here was that I never Actually requested for the list of friends in my facebook graph request...

after replacing FBSDKGraphRequest(graphPath: "me", parameters: nil)

with FBSDKGraphRequest(graphPath: "me?fields=id,name,friends", parameters: nil)

I was able to retrieve the list of friends because the response actually contained information for this. A very trivial mistake on my part.

Answer 2

In v2.0 of the Graph API, you must request the user_friends permission from each user. user_friends is no longer included by default in every login. Each user must grant the user_friends permission in order to appear in the response to /me/friends.

see here : https://developers.facebook.com/bugs/1502515636638396/