keyboardShowAndHide.swift

import Combine
import UIKit

class SampleViewController: UIViewController {

    private var cancellables: Set<AnyCancellable> = []
    
    @IBOutlet private var sampleView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        NotificationCenter.default
            .publisher(for: UIResponder.keyboardWillShowNotification)
            .merge(with: NotificationCenter.default.publisher(for: UIResponder.keyboardWillChangeFrameNotification))
            .receive(on: DispatchQueue.main)
            .sink { [weak self] in self?.animateKeyboard(notification: $0, keyBoardWillShow: true) }
            .store(in: &self.cancellables)

        NotificationCenter.default
            .publisher(for: UIResponder.keyboardWillHideNotification)
            .receive(on: DispatchQueue.main)
            .sink { [weak self] in self?.animateKeyboard(notification: $0, keyBoardWillShow: false) }
            .store(in: &self.cancellables)

    }
    
    private func animateKeyboard(notification: Notification, keyBoardWillShow: Bool) {
        guard
            let rect: CGRect = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect,
            let duration: TimeInterval = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? TimeInterval
        else { return }

        UIView.animate(withDuration: duration,
                       animations: {
                           self.sampleView.transform = keyBoardWillShow ? CGAffineTransform(translationX: 0, y: -rect.size.height + 1) : .identity
                       })
    }
}