我的自制版本的函数通过添加一个plotlist参数，并添加plots <- c(list(...), plotlist)行作为第一行代码来实现，这样它既可以接受一个plot列表，也可以接受单独的plot对象。

grid_arrange_shared_legend_plotlist <- function(..., 
                                                plotlist=NULL,
                                                ncol = length(list(...)),
                                                nrow = NULL,
                                                position = c("bottom", "right")) {

  plots <- c(list(...), plotlist)

  if (is.null(nrow)) nrow = ceiling(length(plots)/ncol)

  position <- match.arg(position)
  g <- ggplotGrob(plots[[1]] + theme(legend.position = position))$grobs
  legend <- g[[which(sapply(g, function(x) x$name) == "guide-box")]]
  lheight <- sum(legend$height)
  lwidth <- sum(legend$width)
  gl <- lapply(plots, function(x) x + theme(legend.position="none"))
  gl <- c(gl, ncol = ncol, nrow = nrow)

  combined <- switch(position,
                     "bottom" = arrangeGrob(do.call(arrangeGrob, gl),
                                            legend,
                                            ncol = 1,
                                            heights = unit.c(unit(1, "npc") - lheight, lheight)),
                     "right" = arrangeGrob(do.call(arrangeGrob, gl),
                                           legend,
                                           ncol = 2,
                                           widths = unit.c(unit(1, "npc") - lwidth, lwidth)))

  grid.newpage()
  grid.draw(combined)

  # return gtable invisibly
  invisible(combined)
}

以您的示例为例：

library(gridExtra)
library(grid)
library(ggplot2)
plots <- list()
dsamp <- diamonds[sample(nrow(diamonds), 300), ]
plots$p1 <- qplot(carat, price, data = dsamp, colour = clarity)
plots$p2 <- qplot(cut, price, data = dsamp, colour = clarity)
plots$p3 <- qplot(color, price, data = dsamp, colour = clarity)
plots$p4 <- qplot(depth, price, data = dsamp, colour = clarity)

grid_arrange_shared_legend_plotlist(plotlist = plots, ncol = 4)

丑陋的文本字符串粘贴解决方案：

由于提供的答案似乎不起作用，或者不适合（重建一组与我已经从大量代码中获得的绘图对象列表完全不同的绘图对象），我使用eval(parse(text = ....)和paste0进行了一些尝试，以动态生成一个文本字符串，最终成为完全写出的代码（它起作用了），而没有实际写出它

nplots = 4
nrow = 2
ncol = ceiling(nplots/nrow)
eval(parse( text = paste0("grid_arrange_shared_legend(", paste0("plotlist", "[[", c(1:nplots), "]]", sep = '', collapse = ','), ",ncol =", ncol, ",nrow =", nrow, ", position = 'right',  top=grid::textGrob('My title', gp=grid::gpar(fontsize=18)))", sep = '')))

其产生：
[1]“grid_arrange_shared_legend（绘图列表1，绘图列表2，绘图列表3，绘图列表4，ncol =2，nrow =2，位置= '右'，顶部=grid：：文本Grob（'My title '，gp=grid：：gpar（fontsize=18））”