Swift 3 - Prepare Segue

Question

I have 3 scenes in my storyboard. My initial View Controller is a Navigation Controller, then there is a relationship root view controller to a UI ViewController (view contr

Answer 1

Replace your code with the following, it will not crash at least.

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "HistorySegue" {
            if let viewController = segue.destination as? HistoryController {
              if(barcodeInt != nil){
                viewController.detailItem = barcodeInt as AnyObject
               }
            }
        }
    }