重新排列堆叠的条形图图例标签而不更改 R 中的图（并修复刻度线）

有没有办法在不改变绘图顺序的情况下更改堆叠条形图图例中因子水平的顺序（并且不会错误地标记数据）？我想先将顺序更改为“在场”，然后是“缺席”。

我也遇到了刻度线略微向一侧移动的问题。

dput(prop)
structure(list(WYR = c(2005L, 2005L, 2006L, 2006L, 2007L, 2007L, 
2008L, 2008L, 2009L, 2009L, 2010L, 2010L, 2011L, 2011L, 2012L, 
2012L, 2013L, 2013L, 2014L, 2014L, 2015L, 2015L, 2016L, 2016L, 
2017L, 2017L, 2018L, 2018L, 2019L, 2019L, 2020L, 2020L), CYR = c(2005L, 
2005L, 2006L, 2006L, 2007L, 2007L, 2008L, 2008L, 2009L, 2009L, 
2010L, 2010L, 2011L, 2011L, 2012L, 2012L, 2013L, 2013L, 2014L, 
2014L, 2015L, 2015L, 2016L, 2016L, 2017L, 2017L, 2018L, 2018L, 
2019L, 2019L, 2020L, 2020L), class = structure(c(1L, 2L, 1L, 
2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 
2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 2L), .Label = c("prop_zero", 
"prop_nonzero"), class = "factor"), proportions = c(0.170212765957447, 
0.829787234042553, 0.170212765957447, 0.829787234042553, 0.361702127659574, 
0.638297872340426, 0.234042553191489, 0.765957446808511, 0.234042553191489, 
0.765957446808511, 0.434782608695652, 0.565217391304348, 0.58695652173913, 
0.41304347826087, 0.574468085106383, 0.425531914893617, 0.51063829787234, 
0.48936170212766, 0.595744680851064, 0.404255319148936, 0.608695652173913, 
0.391304347826087, 0.51063829787234, 0.48936170212766, 0.404255319148936, 
0.595744680851064, 0.319148936170213, 0.680851063829787, 0.468085106382979, 
0.531914893617021, 0.608695652173913, 0.391304347826087)), row.names = c(NA, 
-32L), class = c("tbl_df", "tbl", "data.frame"))

ggplot(prop, aes(x = CYR, y = proportions, fill = class)) +
  geom_bar(position = "fill", stat = "identity") +
  scale_fill_manual(values = c("grey70", "grey20"), labels = c("Absence", "Presence")) + 
  scale_y_continuous(limits = c(0, 1.0), expand = expansion(mult = c(0, 0.05))) +
  scale_x_continuous(breaks = years, labels = ~ rep("", length(.x))) +
  # CYR labels
  annotate(
    geom = "text",
    x = prop$CYR,
    y = -Inf,
    label = prop$CYR,
    size = 6.5 / .pt,
    vjust = 2.5
  ) +
  # WYR labels
  annotate(
    geom = "text",
    x = prop$CYR,
    y = -Inf,
    label = prop$WYR,
    size = 6.5 / .pt,
    vjust = 4,
    color = "grey"
  ) +
  # CYR title
  annotate(
    geom = "text",
    x = -Inf,
    y = -Inf,
    label = c("CYR"),
    vjust = 2.5, hjust = 1,
    size = 6.5 / .pt
  ) +
  # WYR title
  annotate(
    geom = "text",
    x = -Inf,
    y = -Inf,
    label = c("WYR"),
    vjust = 4, hjust = 1,
    size = 6.5 / .pt,
    color = "grey") +
  coord_cartesian(clip = "off") +
  theme(
    axis.text.x.bottom = element_text(margin = margin(t = 8.8, b = 8.8)),
    axis.title.x = element_blank(),
    axis.text.y = element_text(size = 10),
    axis.title.y = element_text(margin = margin(t = 0, r = 10, b = 0, l = 0), size = 14),
    axis.ticks = element_line(colour = "black", size = 1), 
    legend.title=element_blank(),
    panel.border = element_rect(fill = NA, color = "black", size = 1), 
    plot.title = element_text(hjust = 0.5)) +
  labs(y = "% presence/absence") +
  ggtitle("DRY SEASONS")