text: //
  //  GKPresentationAnimation.h
  //  GKAlertController
  //
  //  Created by Apple on 16/2/2.
  //  Copyright © 2016年 zhishu. All rights reserved.
  //
  
  #import "GKPresentationAnimation.h"
  
  @interface GKDropDownPresentationAnimation : GKPresentationAnimation
  
  
  @end
  