在 rmarkdown::beamer_presentation 中插入幻灯片的数量，直到最后一张幻灯片

Question

在使用 rmarkdown::beamer_presentation 生成的 beamer 演示文稿中，我目前有 \insertframenumber/\inserttotalframenumber 显示当前页面和演示文稿中的幻灯片总数。

如何在页脚中插入到“最后一张幻灯片”的幻灯片数量而不是整体“幻灯片总数”？

注意：我想避免必须将 {.noframenumbering} 添加到附录中的所有幻灯片。

MWE

Preamble.tex

\setbeamertemplate{footline}{
    \leavevmode%
    \hfill
        \hyperlinkappendixstart{\insertframenumber/\inserttotalframenumber}
}

Presentation.Rmd

---
title: "Slide counter ends at specific slide"
output:
  bookdown::pdf_book:
    base_format: rmarkdown::beamer_presentation
    latex_engine: lualatex
    toc: false
    slide_level: 2
header-includes:
  - \input{files_beamer/preamble}
---

## Slide 1

## Slide 2

## Slide Final
==> count up to this slide

``` {=latex}
\insertframeendpage
```

## Additional Slide 1 (not counted)

## Additional Slide 2 (not counted)

Answer 1

只需添加到 YAML-header:

header-includes:
  - \usepackage{appendixnumberbeamer}

（参见 this SO post）。

或者，可以在 \setbeamertemplate{footline}{...}.

之前的某处使用类似 \inserttotalframenumber - \insertappendixframenumber 的东西定义一个新命令

Answer 2

如果您的 beamer 版本是最新的，您可以使用 \setbeamertemplate{page number in head/foot}[appendixframenumber] 模板。不需要额外的包。

---
title: "Slide counter ends at specific slide"
output:
  bookdown::pdf_book:
    base_format: rmarkdown::beamer_presentation
    latex_engine: lualatex
    toc: false
    slide_level: 2
    keep_tex: true
header-includes: |
  \makeatletter\beamer@ignorenonframefalse\makeatother

  \setbeamertemplate{page number in head/foot}[appendixframenumber]

  \setbeamertemplate{footline}{%
    \leavevmode%
    \hfill
    \hyperlinkappendixstart{%
      \usebeamertemplate{page number in head/foot}%
    }
  }

---

## Slide 1

## Slide 2

## Slide Final
==> count up to this slide

``` {=latex}
\end{frame}
\appendix
\begin{frame}
\frametitle{Additional Slide 1 (not counted)}
```

## Additional Slide 2 (not counted)