popAnimation.swift

class PopAnimation: NSObject, UIViewControllerAnimatedTransitioning {
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.5
    }
    
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let fromViewController = transitionContext.viewController(forKey: .from), let toViewController = transitionContext.viewController(forKey: .to) else { return }
        let window = UIScreen.main.bounds
        transitionContext.containerView.insertSubview(toViewController.view, belowSubview: fromViewController.view)
        let duration = self.transitionDuration(using: transitionContext)
        UIView.animate(withDuration: duration, animations: {
            fromViewController.view.transform = .init(translationX: window.size.width, y: 1)
            toViewController.view.transform = .identity
        }, completion: { _ in
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        })
    }
    
}