prepareForSegue and PerformSegueWithIdentifier sender

Question

I am wondering about how the functions in the title work and also about the sender parameter.

Lets say a button click calls the performSegue method, does that also call

Answer 1

while sending any object to the particular object to another view controller by using perform segue with an identifier, Please follow the steps #Swift4

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "Detailed_Live_poll"{
        let destinationNavigationController = segue.destination as! UINavigationController
        let targetController = destinationNavigationController.topViewController as! NewLivePollViewController
        targetController.dictQuestInf = sender as! NSDictionary
    }
}