geom_bar change color in R

Question

I created a bar plot via ggplot2 in R using the code below, how can I change the inside color of the bars when only one column is being used in aes ? Please note that the data frame does not have a column named count .

library(ggplot2)

ggplot(data_frame, aes(x = class.1_value)) + 
  geom_bar(color ="steelblue") +
  theme_minimal()

Answer 1

使用fill ="steelblue"而不是color ="steelblue"