Check if an NSString contains an emoji character

string_contains_emoji

- (BOOL)stringContainsEmoji:(NSString *)string {
    __block BOOL returnValue = NO;
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:
     ^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
         
         const unichar hs = [substring characterAtIndex:0];
         // surrogate pair
         if (0xd800 <= hs && hs <= 0xdbff) {
             if (substring.length > 1) {
                 const unichar ls = [substring characterAtIndex:1];
                 const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                 if (0x1d000 <= uc && uc <= 0x1f77f) {
                     returnValue = YES;
                 }
             }
         } else if (substring.length > 1) {
             const unichar ls = [substring characterAtIndex:1];
             if (ls == 0x20e3) {
                 returnValue = YES;
             }

         } else {
             // non surrogate
             if (0x2100 <= hs && hs <= 0x27ff) {
                 returnValue = YES;
             } else if (0x2B05 <= hs && hs <= 0x2b07) {
                 returnValue = YES;
             } else if (0x2934 <= hs && hs <= 0x2935) {
                 returnValue = YES;
             } else if (0x3297 <= hs && hs <= 0x3299) {
                 returnValue = YES;
             } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
                 returnValue = YES;
             }
         }
     }];
    
    return returnValue;
}

Very, very grateful

it works. great.

btw, is there C++ code can do this? thanks.

it works. great.

btw, is there C++ code can do this? thanks.

Great! We are gonna use this code snippet to remove all emoji characters, those characters shows up ugly on android devices, as a cross platform mobile application we implemented our own emoji solution which looks exactly the same on iOS/Android/Web.

In ios7, when input chinese using Pinyin:QWERTY/10 Key, it bugs.

Can I use this code snippet?

@bluefish625 Could you describe what bug exactly concerning Pinyin:QWERTY/10 Key? I cannot find any problem.

@cihancimen , can you please please please please make this in Swift? I really need this! Thanks a lot!

This code doesn't work for all emojis. I have tested it for few emojis. It doesn't work for ☺️ emoji. Can you tell me what could be the reason ?

Surrogate Pairs : the Unicode standard has reserved the range from U+D800 to U+DFFF for the use of UTF-16 (wiki)
but in this code the range is

if (0xd800 <= hs && hs <= 0xdbff) {

did I missed something?

@swalehapatanwala the reason for the ☺️ wrong detection is because the emoji is composed with two codepoints U+263A U+FE0F whilst the code ignores all composite characters which second codepoint is not 0x20e3. Therefore the code must be fixed and improved!

Anyone using this with iOS 8?

is there C++ code can do this?

Shucks. This doesn't work with all emojis.

works, great ,tks

Yes, this doesn't work with all emojis.

Sorry, have you fixed this issue?

In ios7+, when input chinese using Pinyin:QWERTY/10 Key, it bugs. I found this problem as well, you can change into Chinese input way,I make a breakpoint and found the string change was number with gray color around, I just control the input in should change delegate method, so this code return me yes.

I found the solution, just convert the string first
unichar unicodevalue = [text characterAtIndex:0];
NSString *str = [NSString stringWithCharacters:&unicodevalue length:1];
then use this str to judge

The U+d83e u Not included

there are some new emojis added in iOS 16.Looks like this code need to be update