Emoji检测

+(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;
                                    }
                                }
                            } 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;

}