presentViewController and displaying navigation bar

Question

I have a view controller hierarchy and the top-most controller is displayed as a modal and would like to know how to display the navigation bar when using

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Answer 1

Swift 3

        let vc0 : ViewController1 = ViewController1()
        let vc2: NavigationController1 = NavigationController1(rootViewController: vc0)
        self.present(vc2, animated: true, completion: nil)