我正在尝试创建一个后退按钮。我back-button.png在档案夹中有一张图片img。

这是我的代码：

from tkinter import *
import customtkinter as ctk

root = Tk()

ctk.CTkLabel(root, 
  text = 'This is a label', 
  text_font =('Verdana', 17)).pack(side = LEFT, pady = 11)

img = PhotoImage(file="./img/back-button.png")
ctk.CTkButton(root, image = img).pack(side = LEFT)

root.mainloop()

当我运行此代码时，我收到此错误：

Traceback (most recent call last):
  File "c:\Users\User\Desktop\youtube-audio-downloader\tempCodeRunnerFile.py", line 11, in <module>
    ctk.CTkButton(root, image = img).pack(side = LEFT)
  File "C:\Users\User\AppData\Local\Programs\Python\Python39\lib\site-packages\customtkinter\customtkinter_button.py", line 102, in __init__
    self.draw()
  File "C:\Users\User\AppData\Local\Programs\Python\Python39\lib\site-packages\customtkinter\customtkinter_button.py", line 147, in draw
    self.canvas.configure(bg=CTkColorManager.single_color(self.bg_color, self.appearance_mode))
  File "C:\Users\User\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1646, in configure
    return self._configure('configure', cnf, kw)
  File "C:\Users\User\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1636, in _configure
    self.tk.call(_flatten((self._w, cmd))   self._options(cnf))
_tkinter.TclError: unknown color name "."

那么，为什么会这样呢？以及如何在按钮上显示影像？

uj5u.com热心网友回复：

问题是 CtkButton 小部件不像标准小部件那样接受自变量。CtkButton 的第一个自变量是背景颜色，但您传递的是根视窗，而根视窗不是有效颜色。

您需要将根视窗显式分配给master自变量。

ctk.CTkButton(master=root, image = img).pack(side = LEFT)
#             ^^^^^^^