text: //
  //  SelectorBlock.h
  //  sfunctional
  //
  //  Created by rarnu on 2018/9/19.
  //  Copyright © 2018 rarnu. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  typedef void (^callback)(void);
  @interface NSObject (BlockSEL)
  -(SEL)selectorBlock:(callback)block;
  @end
  