-(void)transitionView_from:(UIView*)one to: (UIView*)two {

CATransition *anim = [CATransition animation];

anim.delegate = self;

anim.duration = 0.4f; //动画持续时间

anim.type = kCATransitionMoveIn; //动画样式

anim.subtype = kCATransitionFromTop; //动画过度方向

anim.startPRogress = 0.6 ; //动画开始于60%进度

anim.endProgress = 1; //动画结束于100%进度

NSInteger index_twoView = [[self.view subviews] indexOfObject : two ] ;

NSInteger index_oneView = [[self.view subviews] indexOfObject : one ] ;

[self.view echangeSubviewAtIndex : index_oneView withSubviewAtIndex: index_twoView ]; //动画为two进入，one退出。

[self.view.layer addSAnimation: anim forKey: @"animation"]; //开始动画

}