字符串emoji处理

单个字符emoji转UTF-8

//emojiTab
+ (NSArray*)emojiReplaceTab{
    NSArray * emojiArray  = @[@"😀",@"😁",@"😂",@"😃",@"😄",@"😅",@"😆",@"😈",@"😉",@"😐",
                              @"😑",@"😒",@"😓",@"😔",@"😕",@"😖",@"😗",@"😘",@"😙",@"😠",
                              @"😡",@"😢",@"😣",@"😤",@"😥",@"😦",@"😧",@"😨",@"😩",@"😰",
                              @"😱",@"😲",@"😳",@"😴",@"😵",@"😶",@"😷",@"🙁",@"🙂",@"🙃",
                              @"🙄",@"🤐",@"🤑",@"🤒",@"🤓",@"🤔",@"🤕",@"🤗",@"😊",@"😋",
                              @"😌",@"😍",@"😎",@"😏",@"😚",@"😛",@"😜",@"😝",@"😞",@"😟",
                              @"😪",@"😫",@"😬",@"😭",@"😮",@"😯",@"☺",@"😇",@"👻",@"👿",
                              ];
    return emojiArray;
}




//单个字符emoji转UTF-8
+ (NSString*)emojiToUnicode:(NSString*)text{    
#define MULITTHREEBYTEUTF16TOUNICODE(x,y) (((((x ^ 0xD800) << 2) | ((y ^ 0xDC00) >> 8)) << 8) | ((y ^ 0xDC00) & 0xFF)) + 0x10000
    NSString *hexstr = @"";
    NSArray * emojiArray  = [NSString emojiReplaceTab];
 
    //不在字符表 返回原值
    NSInteger inx = [emojiArray indexOfObject:text];//]text];
    if (inx == NSNotFound){
        return text;
    }
    
    //转Unicode 开始
    hexstr = @"";
    if ([text length] >= 2) {
        
        for (int i = 0; i < [text length] / 2 && ([text length] % 2 == 0) ; i++)
        {
            // three bytes
            if (([text characterAtIndex:i*2] & 0xFF00) == 0 ) {
                hexstr = [hexstr stringByAppendingFormat:@"Ox%1X 0x%1X",[text characterAtIndex:i*2],[text characterAtIndex:i*2+1]];
                
            }
            else
            {// four bytes                
//               hexstr = [hexstr stringByAppendingFormat:@"U+%1X ",MULITTHREEBYTEUTF16TOUNICODE([text characterAtIndex:i*2],[text characterAtIndex:i*2+1])];
                hexstr = [hexstr stringByAppendingFormat:@"U000%1X",MULITTHREEBYTEUTF16TOUNICODE([text characterAtIndex:i*2],[text characterAtIndex:i*2+1])];
                
            }
            
        }
//        PKLog(@"(unicode) [%@]",hexstr);
    }
    else
    {
//        PKLog(@"(unicode) U+%1X",[text characterAtIndex:0]);
        hexstr = text;
    }
    return hexstr;
}

emoji转编码

//将一串含emojy字符的字符串,里面的emoji转为编码字符输出
+ (NSString*)textWithEmojiToText:(NSString*)text{
    NSString *str= text;//@"👻😄🇲🇵是q是打";
    
    __block NSString* converText = @"";
    [str enumerateSubstringsInRange:NSMakeRange(0,str.length) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
        NSString *str = [NSString emojiToUnicode:substring];
        converText = [converText stringByAppendingString:str];
    }];
    return converText;
}

emojy编码字符的字符串,里面的emoji编码转为字符

//将一串含emojy编码字符的字符串,里面的emoji编码转为字符
+ (NSString*)textWithEmojiCodingToText:(NSString*)text{
    NSArray * emojiArray  = [NSString emojiReplaceTab];
    for (NSString * emjoy in emojiArray) {
        NSString* codingText = [NSString emojiToUnicode:emjoy];
        text = [text stringByReplacingOccurrencesOfString:codingText withString:emjoy];
    }
    return text;
}

字符串截取

NSArray *textArray = [text componentsSeparatedByString:@"\n"];