How to transition to a new view controller with code only using Swift

Question

I want to transition from ViewController to secondViewController, when the user presses a UIButton, using code only in Swift.

//Function to transition
func          


        

Answer 1

Updated for Swift 3, some of these answers are a bit outdated.

let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
        let vc : UIViewController = mainStoryboard.instantiateViewController(withIdentifier: "myStoryboardID") as UIViewController
        self.present(vc, animated: true, completion: nil)    }