“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

I fixed the same issue (Swift 4) with IB segue using :

override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
    return navigationController?.topViewController is MainController ? true : false 
}