IOS 更简洁的动画设置方式

func playAnimation()
 {
 UIView.animate(withDuration：5, delay：0, options：
 [.curveEaseOut], animations：{
 let view = self.view.viewWithTag(1)
 view？.frame = CGRect(x：40, y：40, width：0,
 height：0)
 view？.backgroundColor = UIColor.blue
 view？.alpha = 0
 }, completion：{
 (value：Bool) in
 print(“Animaton stop.”)
 self.view.viewWithTag(1)？.removeFromSuperview()
 })
 15 }