let_get_to_animations_7.swift

  func animateTo(frame: CGRect, withDuration duration: TimeInterval, completion: ((Bool) -> Void)? = nil) {
    guard let _ = superview else {
      return
    }
    
    let xScale = frame.size.width / self.frame.size.width
    let yScale = frame.size.height / self.frame.size.height
    let x = frame.origin.x + (self.frame.width * xScale)/2
    let y = frame.origin.y + (self.frame.height * yScale)/2
    UIView.animate(withDuration: duration, delay: 0, options: .curveLinear, animations: {
      self.layer.position = CGPoint(x: x, y: y)
      self.transform = self.transform.scaledBy(x: xScale, y: yScale)
          }, completion: completion)