MoveInOutViewController.swift

import UIKit

class MoveInOutViewController: UIViewController {
    
    private weak var cardView: UIView!
    private var cardViewHiddenConstraints: [NSLayoutConstraint]!
    private var cardViewPresentConstraints: [NSLayoutConstraint]!
    
    override func loadView() {
        self.view = UIView()
        self.view.backgroundColor = .white
        self.loadViews()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.showCardView()
    }
    
    private func loadViews() {
        let cardView = UIView()
        cardView.translatesAutoresizingMaskIntoConstraints = false
        cardView.backgroundColor = .white
        cardView.layer.masksToBounds = false
        cardView.layer.cornerRadius = 5
        cardView.layer.borderColor = UIColor.lightGray.cgColor
        cardView.layer.borderWidth = 1.5
        cardView.layer.shadowColor = UIColor.black.cgColor
        cardView.layer.shadowRadius = 3
        cardView.layer.shadowOpacity = 0.8
        cardView.layer.shadowOffset = CGSize(width: 0, height: 3.0)
        self.view.addSubview(cardView)
        self.cardView = cardView
        
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = "Buy me"
        self.cardView.addSubview(label)
        
        let button = UIButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle("Nah I'm good", for: .normal)
        button.addTarget(self, action: #selector(self.dismissCardView), for: .touchUpInside)
        button.setTitleColor(.systemBlue, for: .normal)
        self.cardView.addSubview(button)
        
        self.cardViewHiddenConstraints = [
            cardView.leftAnchor.constraint(equalTo: self.view.rightAnchor)
        ]
        self.cardViewPresentConstraints = [
            cardView.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: -10)
        ]
        NSLayoutConstraint.activate([
            cardView.widthAnchor.constraint(equalTo: self.view.widthAnchor, multiplier: 0.5),
            cardView.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.4),
            cardView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor),
            label.centerXAnchor.constraint(equalTo: cardView.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: cardView.centerYAnchor),
            button.centerXAnchor.constraint(equalTo: cardView.centerXAnchor),
            button.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 5)
        ] + self.cardViewHiddenConstraints)
    }
    
    private func showCardView() {
        NSLayoutConstraint.deactivate(self.cardViewHiddenConstraints)
        UIViewPropertyAnimator.runningPropertyAnimator(
            withDuration: 1.0,
            delay: 0.0,
            options: .curveEaseOut,
            animations: {
                NSLayoutConstraint.activate(self.cardViewPresentConstraints)
                self.view.layoutIfNeeded()
            },
            completion: nil)
    }
    
    @objc private func dismissCardView() {
        NSLayoutConstraint.deactivate(self.cardViewPresentConstraints)
        UIViewPropertyAnimator.runningPropertyAnimator(
            withDuration: 1.0,
            delay: 2.0,
            options: .curveEaseOut,
            animations: {
                NSLayoutConstraint.activate(self.cardViewHiddenConstraints)
                self.view.layoutIfNeeded()
            },
            completion: nil)
    }
}