我弄乱了UIViewPropertyAnimator的文档我希望找到一种方法来组合两个UIViewPropertyAnimator。像这样:letfirstAnimator=UIViewPropertyAnimator(duration:2,dampingRatio:0.4,animations:animation1)letsecondAnimator=UIViewPropertyAnimator(duration:2,dampingRatio:0.4,animations:animation2)firstAnimator.addAnimator(secondAnimator,with