iOS Emoji表情编码/解码

之前做弹幕的时候 遇到的表情编码解码问题

 表情编码一般是使用unicode编码 ，编码之后的格式 \ud83d\ude18\ud83d\ude18world\u4e16\u754chaha\ud83d\ude17

  //编码NSString *uniStr = [NSString stringWithUTF8String:[_barrageText.text UTF8String]];NSData *uniData = [uniStr dataUsingEncoding:NSNonLossyASCIIStringEncoding];NSString *goodStr = [[NSString alloc] initWithData:uniData encoding:NSUTF8StringEncoding] ;NSLog(@"---编码--->[%@]",goodStr);//解码const char *jsonString = [goodStr UTF8String];   // goodStr 服务器返回的 jsonNSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];NSString *goodMsg1 = [[NSString alloc] initWithData:jsonData encoding:NSNonLossyASCIIStringEncoding];NSLog(@"---解码--->[%@]",goodMsg1);2016-04-15 10:16:17.858 DFRomwe[650:153981] ---编码--->[hello\ud83d\ude18\ud83d\ude18world\u4e16\u754chaha\ud83d\ude17]2016-04-15 10:16:17.859 DFRomwe[650:153981] ---解码--->[hello??world世界haha?]