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Move up textfield when keyboard appears on UIViewController in Swift import UIKit import Foundation import Alamofire class ViewController: UIViewController , UIScrollViewDelegate , UITextFieldDelegate {          @IBOutlet weak var scrollViewBottonConstraint: NSLayoutConstraint !     @IBOutlet weak var emailTextField: UITextField !     @IBOutlet weak var passwordTextfield: UITextField !          @IBOutlet weak var scrollView: UIScrollView !               override func viewDidLoad() {         super . viewDidLoad ()         scrollView . contentSize = view . frame . size         let tabGesture = UITapGestureRecognizer (target: self , action: #selector (didTapView(gesture:)))         view . addGestureRecognizer (tabGesture)     } ...