判断NSString字符串是否包含emoji表情

/**
 *
 *  判断NSString字符串是否包含emoji表情
 *
 *  @param BOOL 输入文字
 *
 *  @return 判断结果
 */

- (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) {
            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;
}