title: Integrate Box IOS sdk in my ios project
body: <p>I'm trying to integrate BOX V2 IOS SDk on my ios project , the integration is fine, but when I try to login , and after I enter my username and password and granted the access , I get a white screen , and the boxAPIAuthenticationDidSucceed method is not called , her is my code 
  <strong>the connexion Method :</strong></p>
  
  <pre><code>-(void) connectToBox {
    [BoxSDK sharedSDK].OAuth2Session.clientID = @"my-client-id";
    [BoxSDK sharedSDK].OAuth2Session.clientSecret = @"my-client-secret";
  
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(boxAPIAuthenticationDidSucceed:)
                                                 name:BoxOAuth2SessionDidBecomeAuthenticatedNotification
                                               object:[BoxSDK sharedSDK].OAuth2Session];
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(boxAPIAuthenticationDidFail:)
                                               name:BoxOAuth2SessionDidReceiveAuthenticationErrorNotification
                                             object:[BoxSDK sharedSDK].OAuth2Session];
  
  
  self.LoginCotroller = [[BoxAuthorizationViewController alloc] initWithAuthorizationURL:authorizationURL redirectURI:redirectURI];
  
  [self presentViewController:self.LoginCotroller animated:YES completion:nil];
  
  }
  </code></pre>
  
  <p>and I implement the two methods :</p>
  
  <pre><code>- (void)boxAPIAuthenticationDidSucceed:(NSNotification *)notification;
  - (void)boxAPIAuthenticationDidFail:(NSNotification *)notification;
  </code></pre>
  
  <p>and the notifications methods :</p>
  
  <pre><code>#pragma mark - Handle OAuth2 session notifications
  - (void)boxAPIAuthenticationDidSucceed:(NSNotification *)notification
  {
   BoxOAuth2Session *session = (BoxOAuth2Session *) notification.object;
   NSLog(@"Received OAuth2 successfully authenticated notification");
   NSLog(@"Access token  (%@) expires at %@", session.accessToken,  session.accessTokenExpiration);
    NSLog(@"Refresh token (%@)", session.refreshToken);
  
    dispatch_sync(dispatch_get_main_queue(), ^{
      [self.LoginCotroller dismissViewControllerAnimated:YES completion:nil];
  });
  }
  
  - (void)boxAPIAuthenticationDidFail:(NSNotification *)notification
  {
     NSLog(@"Received OAuth2 failed authenticated notification");
     NSString *oauth2Error = [[notification userInfo]     valueForKey:BoxOAuth2AuthenticationErrorKey];
     NSLog(@"Authentication error  (%@)", oauth2Error);
  
     dispatch_sync(dispatch_get_main_queue(), ^{
         [self dismissViewControllerAnimated:YES completion:nil];
     });
  }
  </code></pre>
  
  <p>I dont know what wrong with my code.So if any one can help.Thanks</p>