Swift can't get Facebook username - ios

Question

I use the lastest Facebook SDK in swift. My problem is when I try to pass my Facebook name into a variable. There is my code :
func returnUserData()
{
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil)
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in
if ((error) != nil)
{
// Process error
println("Error: \(error)")
}
else
{
// This variable is declared under my class declaration
self.userFacebook = result.valueForKey("name") as! String
println(self.userFacebook) //it's works, my Facebook name appear
}
})
}
But, when I try to use my variable "userFacebook" outsite of this function (returnUserData), the result is "nil".
I don't understand why my variable is set only in the function and not in my class.
Thanks

Answer 1

You pass parameter request what data is get for example get name.
request parameter like this
["fields": "id, name, first_name, last_name, picture.type(large), email"]
Try this code :
#IBAction func btnFBLoginPressed(sender: AnyObject) {
var fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager .logInWithReadPermissions(["email"], handler: { (result, error) -> Void in
if (error == nil){
var fbloginresult : FBSDKLoginManagerLoginResult = result
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
fbLoginManager.logOut()
}
}
})
}
func getFBUserData(){
if((FBSDKAccessToken.currentAccessToken()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).startWithCompletionHandler({ (connection, result, error) -> Void in
if (error == nil){
println(result)
println(result["name"])
}
})
}
}