      * Singleton
      **/
     static let shared = GBHFacebookHelper()
-
+    
     
     // MARK: - Retrieve Facebook's Albums
     

    func login(vc: UIViewController,
               completion: @escaping (Bool, LoginError?) -> Void) {
        
        self.logout() // Flush Facebook login
        
        // Start Facebook's login
        let loginManager = FBSDKLoginManager()
        loginManager.logIn(withReadPermissions: ["user_photos"],
                           from: vc) { (response, error) in
                            if(error != nil) {
                                // Failed
                                print("Failed to login")
                                print(error.debugDescription)
                                completion(false, LoginError.LoginFailed)
                            } else {
                                // Success
                                if response?.isCancelled == true {
                                    // Login Cancelled
                                    completion(false, LoginError.LoginCancelled)
                                } else {
                                    if response?.token != nil {
                                        // Check "user_photos" permission statut
                                        if (response?.declinedPermissions.contains("user_photos"))! {
                                            // "user_photos" is dennied
                                            completion(false, LoginError.PermissionDenied)
                                        } else {
                                            // "user_photos" is granted, let's get user's pictures
                                            self.fbAlbumRequest(after: nil)
                                            completion(true, nil)
                                        }
                                    } else {
                                        // Failed
                                        completion(false, LoginError.LoginFailed)
                                    }
                                }
                            }
        }
    }
}

    // MARK: - Login
    
    /**
     * Start login with Facebook SDK
     * Parameters :
     * - vc : source controller
     * - completion(success , error if needed)
