UIView

import UIKit

weak var viewTopConstraint: NSLayoutConstraint!
weak var visualEffectView: UIVisualEffectView!
weak var cardView: UIView!

var initialTouchPoint: CGPoint = CGPoint(x: 0,y: 0)

func update(_ translation: CGPoint, origin: CGPoint) {
    
    let offSetY = translation.y
    
    cardView.frame.origin.y = offSetY
    
    let multiplier = 1 - (translation.y / 2000)
    visualEffectView.alpha = multiplier
}

func cancel(_ origin: CGPoint) {
    
    let animator = UIViewPropertyAnimator(duration: 0.6, dampingRatio: 0.6) {
        visualEffectView.alpha = 1
        cardView.alpha = 1.0
        cardView.center = origin
    }
    animator.startAnimation()
}

func finish() {
    let animator = UIViewPropertyAnimator(duration: 0.9, dampingRatio: 0.9) {
        visualEffectView.effect = nil
    }
    animator.startAnimation()
}

func panGestureAction(_ sender: UIPanGestureRecognizer) {
    
    let originalCardPosition = cardView.center
    
    let translation = sender.translation(in: cardView)
    let origin = sender.location(in: cardView)
    
    switch sender.state {
    case .changed:
        
         if translation.y > 50 { update(translation, origin: origin) }
        
    case .ended:
         let translation = sender.translation(in: cardView)
         if translation.y > 100 {
            finish()
        } else {
            cardView.alpha = 1.0
            cancel(originalCardPosition)
        }
    case .cancelled:
        cancel(originalCardPosition)
    default: break
    }
    
}