ng enter和ng使动画无法使用离子视图

Question

如何在离子视图中使用ng-enter和ng-leave动画？

<ion-view class="kitchenmenu"></ion-view>

CSS：

.kitchenmenu{background:yellow}

.kitchenmenu.ng-leave      {
  -webkit-animation: animated slideInDown 0.5s both ease-in;
  -moz-animation:animated slideInDown 0.5s both ease-in;
  animation: animated slideInDown 0.5s both ease-in;
}
.kitchenmenu.ng-enter    { 
  -webkit-animation:animated slideInUp 0.5s both ease-in;
  -moz-animation:animated slideInUp 0.5s both ease-in;
  animation:animated slideInUp 0.5s both ease-in;  
}

但上述方法无效。我尝试添加ng-view指令，但没有帮助。