removing emoji in iOS

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  (NSString*)removeEmoji { __block NSMutableString* temp = [NSMutableString string];

  
  

  [self enumerateSubstringsInRange: NSMakeRange(0, [self length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:

  
  

  ^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop){

  
  

  
   const unichar hs = [substring characterAtIndex: 0];
  
   if (0xd800 <= hs && hs <= 0xdbff) // surrogate pair
   {
       const unichar ls = [substring characterAtIndex: 1];
  
       const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
  
       [temp appendString: (0x1d000 <= uc && uc <= 0x1f77f)? @"": substring]; // U+1D000-1F77F
   }
  
   else // non surrogate
   {
       [temp appendString: (0x2100 <= hs && hs <= 0x26ff)? @"": substring]; // U+2100-26FF
   }
  
  

  
  

  }];

  
  

  return temp; }

  
  

removing emoji in iOS