iOS 判定字符串是否包含emoji

项目有需求需要判定字符串中是否包含表情包，于是百度，google啥手段都用尽了，试了一个又一个的方法，最后发现下面这段代码靠谱点

- (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];
                                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;
                                            NSLog(@"%@",substring);
                                            [self changeToString:substring];
                                        }
                                    }
                                } else if (substring.length > 1) {
                                    const unichar ls = [substring characterAtIndex:1];
                                    if (ls == 0x20e3) {
                                        returnValue = YES;
                                    }
                                } else {
                                    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;
}

然后美滋滋的去实验，结果发现很多新出的emoji都不能识别出来，估摸着是emoji判定的范围的不对。就想着更新最新的emoji的unicode码范围。
用control+command+空格弹出字符检视器，就能看到系统自带的emoji，但是现在还看不到emoji的unicode码。点击左上角的设置图标

截屏2020-06-04 下午4.50.23.png

选择自定列表，然后一直往下拉，勾选代码表里的Unicode

截屏2020-06-04 下午4.51.56.png

完成后，返回再点击随意一个emoji表情，在右侧就有该emoji的unicode码了。

截屏2020-06-04 下午4.53.04.png

再然后就是茫茫多的去比对unicode值了。最后更新最后的结果代码

- (BOOL)isContainEmoji {
    __block BOOL containsEmoji = NO;
    [self enumerateSubstringsInRange:NSMakeRange(0,[self 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 <= 0x1FAD6) {
                     containsEmoji = YES;
                 }
             }
         }else if (substring.length > 1) {
             const unichar ls = [substring characterAtIndex:1];
             if (ls == 0x20e3 ||
                 ls == 0xfe0f ||
                 ls == 0xd83c) {
                 containsEmoji = YES;
             }
         } else {
             // non surrogate
             if (0x2100 <= hs && hs <= 0x27ff) {
                 containsEmoji = YES;
                 if (0x278b <= hs && hs <= 0x2792) {
                     containsEmoji = NO;
                 }
             }else if (0x2B05 <= hs && hs <= 0x2b07) {
                 containsEmoji = YES;
             } else if (0x2934 <= hs && hs <= 0x2935) {
                 containsEmoji = YES;
             }else if (0x3297 <= hs && hs <= 0x3299) {
                 containsEmoji = YES;
             }else if (hs == 0xa9 ||
                      hs == 0xae ||
                      hs == 0x303d ||
                      hs == 0x3030 ||
                      hs == 0x2b55 ||
                      hs == 0x2b1c ||
                      hs == 0x2b1b ||
                      hs == 0x2b50) {
                 containsEmoji = YES;
             }
         }
         if (containsEmoji) {
             *stop = YES;
         }
     }];
    return containsEmoji;
}

更新至iOS14.2 emoji 13.0
如有问题，请提出指教