OC 富文本添加多个图片

富文本中计算多个占位符的range，然后替换成对应图片

用 ^^^^ 占位，然后逆序替换成对应的图片

    NSString *note;
    NSArray *imageArr;
    if (_page_type == Outdoor_Guide_Page_Type_1) {
        note = LOCALSTRING(@"1. Select a speaker as outdoor master speaker.\n2. Long press “^^^^” button to enter outdoor master mode.");
        imageArr = @[@"OutdoorGuide_btn_001"];
    } else {
        note = LOCALSTRING(@"Long press “^^^^” button and “^^^^” on your expected speakers that would connected to outdoor master speaker.");
        imageArr = @[@"OutdoorGuide_btn_001",@"OutdoorGuide_btn_002"];
    }
    [self setupNoteLabel:note imageArray:imageArr];

- (void)setupNoteLabel:(NSString *)note imageArray:(NSArray *)imageArr {
    NSMutableArray *imgStrArr = [NSMutableArray array];
    for (int i = 0; i < imageArr.count; i++) {
        NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
        textAttachment.image = [UIImage imageNamed:imageArr[i]];
        NSAttributedString *imgStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
        [imgStrArr addObject:imgStr];
    }
    
    NSMutableParagraphStyle *pStyle = [[NSMutableParagraphStyle alloc]init];
    pStyle.lineSpacing = 8;
    
    NSMutableAttributedString *noteStr = [[NSMutableAttributedString alloc] initWithString:note];
    [noteStr addAttributes:@{NSForegroundColorAttributeName: THEME_LIGHT_COLOR,
                             NSFontAttributeName: [UIFont systemFontOfSize:14],
                             NSParagraphStyleAttributeName:pStyle}
                     range:NSMakeRange(0, noteStr.length)];
    
    
    // 正则匹配 占位符
    NSString *regexStr = @"(\\^\\^\\^\\^)";
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regexStr options:0 error:nil];
    NSArray *matches = [regex matchesInString:note options:0 range:NSMakeRange(0, note.length)];
    
    NSMutableArray *rangeArr = [NSMutableArray array];
    // 倒序获取 占位符ranges (防止正序替换的时候，由于图片replace后造成的整体location错误)
    [matches enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(NSTextCheckingResult *result, NSUInteger idx, BOOL * _Nonnull stop) {
        NSRange range = result.range;
        [rangeArr addObject:[NSValue valueWithRange:range]];
    }];
    
    // 替换
    for (int i = 0; i < rangeArr.count; i++) {
        NSValue *value = rangeArr[i];
        NSRange range = value.rangeValue;
        [noteStr replaceCharactersInRange:range withAttributedString:imgStrArr[rangeArr.count - 1 - i]];
    }
    
    _noteLabel.attributedText = noteStr;
}

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