Emoji检测

+(BOOL)stringContainsEmoji:(NSString *)string
{

__block BOOL returnValue = NO;[string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequencesusingBlock:^(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;        }    }} 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;

}