HTML encode emojis

gistfile1.m

NSString *text = @"😀abc🇯🇵";
NSMutableString *convertedText = @"".mutableCopy;

[text enumerateSubstringsInRange:NSMakeRange(0,[text length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
    
    unsigned int i = (unsigned int)*(const UInt32 *)[[substring dataUsingEncoding:NSUTF8StringEncoding] bytes];
    
    if (i > 8436960) {
        NSData *data = [substring dataUsingEncoding:NSUTF32BigEndianStringEncoding];
        NSString *str = [NSString stringWithFormat:@"%@",data];
        str = [str substringWithRange:NSMakeRange(1, [str length]-2)];
        for (NSString *c in [str componentsSeparatedByString:@" "]) {
            [convertedText appendString:[NSString stringWithFormat:@"&#x%@;",c]];
        }
    } else {
        [convertedText appendString:substring];
    }
    
}];

NSLog(@"%@",convertedText);

NSData *stringData = [convertedText dataUsingEncoding:NSUTF8StringEncoding];
NSAttributedString *attrString =[[NSAttributedString alloc]initWithData:stringData options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType} documentAttributes:nil error:nil];
NSString *finalString = attrString.string;
    
NSLog(@"%@",finalString);