text: 
  /**
   *  UIImage+LL.h
   */
  #import <UIKit/UIKit.h>
  
  @interface UIImage (LL)
  /**
   *  打水印
   *
   *  @param backgroundImage   背景图片
   *  @param markName 右下角的水印图片
   */
  + (instancetype)waterMarkWithImageName:(NSString *)backgroundImage andMarkImageName:(NSString *)markName;
  @end
  