Show offline-mode

What is the best 开发者_Python百科way to show a user that he is in offline mode? Does Apple provide anything like a toolbar icon or what would be the best practice on that?

Just use an alertview with a message notifying the user that he has no internet available.

Example:

  UIAlertView *someError = [[UIAlertView alloc] initWithTitle: @"Network error" 
                                                message: @"Error sending 
                                                         your info to the server"  
                                                delegate: self 
                                                cancelButtonTitle: @"Ok" 
                                                otherButtonTitles: nil];



  [someError show];

  [someError release];

I'm not sure if this is what you aim for but it is a suggestion.