text: //
  //  NSData+DBHexString.h
  //  DBSM2
  //
  //  Created by 徐结兵 on 2019/6/27.
  //
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  @interface NSData (DBHexString)
  
  + (NSData *)dbDataFromHexString:(NSString *)hexString;
  
  - (NSString *)hexString;
  
  @end
  
  NS_ASSUME_NONNULL_END
  