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 }