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Move up textfield when keyboard appears on UIViewController in Swift



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)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        addObservers()
    }
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        removeObservers()
    }
    
    @objc func didTapView(gesture: UITapGestureRecognizer){
        
        view.endEditing(true)
    }
    
    func addObservers(){
        let notificationCenter = NotificationCenter.default
        notificationCenter.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
        
        notificationCenter.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
    }
    
    func removeObservers() {
        NotificationCenter.default.removeObserver(self)
    }
    
    @objc func keyboardWillShow(notification: Notification){

        guard let userInfo = notification.userInfo, let frame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else {
            return
        }
        let conntentInset = UIEdgeInsets(top: 0, left: 0, bottom: frame.height, right: 0)
        scrollView.contentInset = conntentInset
    }
    @objc func keyboardWillHide(notification: Notification){
        scrollView.contentInset = UIEdgeInsets.zero
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool
    {
        textField.resignFirstResponder()
        return true
    }
    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

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