Swift 你能在没有segue的情况下更改视图控制器吗？

基本上我有一个改变标题的按钮，如果按钮标题是我想让按钮带用户去不同的地方，如果按钮标题是其他东西

let act1 = act1ViewController()
let act2 = act2ViewController()

override func viewDidLoad() {
    super.viewDidLoad()

    self.buttonName.setTitle(self.text, for: .normal)
    // Do any additional setup after loading the view.
}

@IBAction func buttonPressed(_ sender: UIButton) {

   if text == "cheer up" {
    self.present(act1, animated: true, completion: nil)

}
   else if text == "yay" {
    self.present(act2, animated: true, completion: nil)
    }

---

}

根据if检查实例化ViewController，并显示它：

let storyBoard: UIStoryboard = UIStoryboard(name: "MyStoryboard", bundle: nil)
let destinationVC = storyBoard.instantiateViewController(withIdentifier: "ViewControllerIdentifier") as! NewViewController
present(destinationVC, animated: true, completion: nil)

---

如果要显示的两个控制器是

class Act1ViewController: UIViewController {
    //your code...
}

class Act2ViewController: UIViewController {
    //your code...
}

您只需在

按钮名称上放置开关盒，并显示相关控制器
act1
或
act2
。使用故事板创建
act1
和
act2

@IBAction func buttonPressed(_ sender: UIButton) {
    switch sender.titleLabel?.text {
    case "cheer up":
        if let act1 = self.storyboard?.instantiateViewController(withIdentifier: "Act1ViewController") as? Act1ViewController {
            self.present(act1, animated: true, completion: nil)
        }

    case "yay":
        if let act2 = self.storyboard?.instantiateViewController(withIdentifier: "Act2ViewController") as? Act2ViewController {
            self.present(act2, animated: true, completion: nil)
        }

    default:
        break
    }
}

}

不要忘记将
Act1ViewController
和
Act2ViewController
设置为
storyboard
中相应控制器的
storyboard
我认为我的let act1=Act1ViewController（）let act2=Act2ViewController（）是我尝试运行代码时的问题。。。我怎么修理它？？
@IBAction func buttonPressed(_ sender: UIButton) {
    switch sender.titleLabel?.text {
    case "cheer up":
        if let act1 = self.storyboard?.instantiateViewController(withIdentifier: "Act1ViewController") as? Act1ViewController {
            self.present(act1, animated: true, completion: nil)
        }

    case "yay":
        if let act2 = self.storyboard?.instantiateViewController(withIdentifier: "Act2ViewController") as? Act2ViewController {
            self.present(act2, animated: true, completion: nil)
        }

    default:
        break
    }
}