我是iOS开发的新手，最近在iOS9中遇到了自定义转换的问题。我有一个对象符合UIViewControllerTransitioningDelegate协议(protocol)并实现了animationControllerForDismissedController，类似于:@implementationMyCustomizedTransitioningDelegate#pragmamark-UIViewControllerTransitioningDelegate-(id)animationControllerForDismissedController:(UIViewControl