text: 
  
  #define kLUHUnderLineButtonUnderLineTag 2000
  #define kLUHUnderLineButtonUnderLinePadding 10
  #define kLUHUnderLineButtonUnderLineHeight 4
  
  #import <UIKit/UIKit.h>
  
  @interface XLsn0wUnderlineButton : UIView
  
  @property (nonatomic) NSInteger selectedIndex;
  
  - (nullable instancetype)initWithItems:(nullable NSArray *)items;
  - (void)addTarget:(nullable id)target action:(nonnull SEL)action;
  
  @end
  