效果可以在animateTransition方法中实现如下代码:UIView.animateWithDuration(duration,delay:0,usingSpringWithDamping:0.3,initialSpringVelocity:0.0,options:.CurveLinear,animations:{fromVC.view.alpha=0.5toVC.view.frame=finalFrame},completion:{_->()infromVC.view.alpha=1.0transitionContext.completeTransition(true)})但