Login authorisation APIV2

I am usin this metod in-viewdidLoad to authorize loginf rom the login browser controller of dropbox.

 [DBClientsManager authorizeFromController:[UIApplication sharedApplication]
                                   controller:self
                                      openURL:^(NSURL *url)
     {
         [[UIApplication sharedApplication] openURL:url];
         
     }];

but after first time it is approved and when i cam again at the same screen again it appears the Dropbox browser login controller. How i can avoid this once it approve the authorization.