CODE EXAMPLE FOR SWIFT

ios uikit hide/show keyboard if scrolling

// ViewController.swift
class ScrollViewController: UIViewController {

  @IBOutlet weak var scrollView: UIScrollView!
    
  override func viewDidLoad() {
    super.viewDidLoad()

      // Do any additional setup after loading the view.
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
  }
  
  @objc func keyboardWillShow(notification: NSNotification) {
    guard let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
    else {
      // if keyboard size is not available for some reason, dont do anything
      return
    }

    let contentInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: keyboardSize.height , right: 0.0)
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
  }

  @objc func keyboardWillHide(notification: NSNotification) {
    let contentInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: 0.0, right: 0.0)
		
    
    // reset back the content inset to zero after keyboard is gone
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
  }
}