如何将.xib ViewController转到情节提要ViewController，再将情节提要转到.xib View

Question

这是我的第一个.xib ViewController如何将此ViewController转到情节提要ViewController

class FirstViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()


}

这是故事板secondViewController，我想再次将此ViewController转到.xib ViewController

class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()


}

Answer 1

从.xib到.ste板：

let sb = UIStoryboard(name: "the-name-of-the-storyboard", bundle: nil)
let ctrl = sb.instantiateViewController(withIdentifier: "SecondViewControllerIdentifier")
self.present(ctrl, animated: true, completion: nil)

请记住，SecondViewControllerIdentifier是故事板场景的标识符；它不是控制器的类名

从.syboard到.xib:

let ctrl = FirstViewController()
self.present(ctrl, animated: true, completion: nil)

假设FirstViewController.xib或First.xib存在