Extension for UIView, to make pop up animation

UIViewInOut.swift

extension UIView {
    //adding subview to a view, animated
    func animateIn(view: UIView) {
        self.backgroundColor = .clear
        self.addSubview(view)
        view.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
        view.alpha = 0
        
        UIView.animate(withDuration: 0.3) {
            view.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
            view.alpha = 1
        }
    }
    //removing subview from a view, animated
    func animateOut(view: UIView) {
        UIView.animate(withDuration: 0.3, animations: {
            view.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
            view.alpha = 0
        }) { _ in
            view.removeFromSuperview()
        }
    }
}