“Pushing the same view controller instance more than once is not supported” exception

Question

I am using the following code to retrieve some messages and putting them into my inbox.

MyInboxVC *inboxVC=[MyInboxVC get ];
//upload all the pending messag         


        

Answer 1

Make sure you are not adding the view controller twice in the navigation stack. Eg - in below example self.mainViewC is pushed twice because it is initially instantiated in the navController, and is then pushed onto the navController again in the last line, which would cause this issue.

  navController=[[UINavigationController alloc] initWithRootViewController:self.mainViewC];  
  self.window.rootViewController = navController;
  [self.window makeKeyAndVisible];        
  [navController pushViewController:self.mainViewC animated:NO]; 

In this case mainViewC has already been added to stack when initWithRootViewController was written. There is no need of pushViewController again.