addSubview and removeFromSuperview animation in Swift 4.0

animation.swift

# addSubview
UIView.transition(with: self.view, duration: 0.25, options: [.transitionCrossDissolve], animations: {
  self.view.addSubview(view)
}, completion: nil)

# removeFromSuperview
UIView.transition(with: self.view, duration: 0.25, options: [.transitionCrossDissolve], animations: {
  subview.removeFromSuperview()
}, completion: nil)

Thanks, man!

Thanks.