title: Change title button from another class
body: <p>please help how change title button from another class</p>
  <p>The Class in which to change</p>
  <pre><code>protocol ChangeButtonDelegate: class {
      func changeButton(sender: UIButton)
  }
  
  class SubscribeVC : UIViewController {
      @IBAction func tryButtonAction(_ sender: UIButton) {
          delegate?.changeButton(sender: sender)
          subscribeCheck = true
          view.removeFromSuperview()
      }
  }
  </code></pre>
  <p>In this class the button to be changed</p>
  <pre><code>class OrderVC: UIViewController, ChangeButtonDelegate {
  
  override func viewDidLoad() {
          super.viewDidLoad()
          
          subscribe.delegate = self
  }
  
  func changeButton(sender: UIButton) {
          orderButton.setTitle(&quot;Check&quot;, for: .normal)
      }
  }
  </code></pre>