You can, provided that when you authenticate with Facebook, you request permission user_friends
to access the list of friends.
The request to pick up the friends list is as follows:
let meRequest = FBSDKGraphRequest(graphPath: "me/friends", parameters: nil)
meRequest.startWithCompletionHandler({ (connection: FBSDKGraphRequestConnection!, result: AnyObject!, error: NSError!) -> Void in
if (error != nil) {
println(result) // Lista de amigos (paginada)
}
})
A great place to start with integrating with the Facebook SDK is their own page: Facebook SDK for iOS - Getting Started