text: //
  //  NSObject+Helper.h
  //  DCCategories
  //
  //  Created by quanzhizu on 2017/5/22.
  //  Copyright © 2017年 quanzhizud2c. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  @interface NSObject (Helper)
  
  +(BOOL)notNull:(id)object;
  
  +(BOOL)isNull:(id)object;
  
  +(void)setObject:(id)object key:(NSString *)key;
  +(id)getObjectWithKey:(NSString *)key;
  
  @end
  