text: 
  #import "BABuilder.h"
  
  @interface BAPaddingBuilder : BABuilder
  
  @property (nonatomic, strong) BAVoidBlock head;
  @property (nonatomic, strong) BAVoidBlock tail;
  @property (nonatomic, strong) BAVoidBlock up;
  @property (nonatomic, strong) BAVoidBlock down;
  
  @end
  
  