求助：MacOS Ventura下Tkinter按钮阴影无法消除问题

问题描述 #

在MacOS Ventura系统中使用Tkinter创建按钮时，即便设置了highlightthickness=0和borderwidth=0，且已将Python、pip、Tkinter更新至最新版本，按钮仍会带有阴影；但相同代码在其他设备上可正常运行。

代码示例 #

from tkinter import *

win = Tk()

# settings
window_height = 500
window_width = 500

# window
win.title("Polygon Selector")
win.resizable(False, False)
win.geometry(str(window_width) + "x" + str(window_height))
win.configure(bg="#F7F7F7")
can = Canvas(win,width=window_width,height=window_height,bg="#F7F7F7",highlightthickness=0)
can.place(x=0,y=0)

# content
label1 = Label(win,text="Here you can create different polygons\n!! HAVE FUN !!",
fg="#FFB26B", bg="#F7F7F7")
label1.pack()

button = Button(win, text="To the selection", bg="#000000",highlightthickness=0, borderwidth=0)
button.pack()

win.mainloop()

可行解决思路 #

• 调整系统UI设置：MacOS Ventura的系统渲染规则可能强制给按钮添加阴影，可尝试以下操作：
  1. 打开「系统设置」→「辅助功能」→「显示」
  2. 勾选「降低透明度」，测试按钮阴影是否消失
  3. 若无效，再勾选「增强对比度」重新测试
• 用ttk.Style自定义按钮样式：ttk组件支持更灵活的样式定制，可绕过原生系统的按钮渲染逻辑：

  from tkinter import ttk, Tk
  
  win = Tk()
  style = ttk.Style()
  # 定义无阴影按钮样式
  style.configure('NoShadow.TButton', background='#000000', foreground='white', borderwidth=0, relief='flat')
  # 使用自定义样式创建按钮
  button = ttk.Button(win, text="To the selection", style='NoShadow.TButton')
  button.pack()
  win.mainloop()
  

• 更换Python环境：MacOS自带的Python可能与Ventura的UI框架存在兼容问题，尝试用Homebrew安装独立Python版本：
  1. 安装Homebrew：/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  2. 安装Python：brew install python
  3. 使用该版本Python运行代码：python3 your_script.py
• 用Canvas绘制自定义按钮：完全绕过原生Button组件，手动绘制按钮外观并绑定事件：

  from tkinter import Tk, Canvas, Label
  
  win = Tk()
  window_height = 500
  window_width = 500
  win.title("Polygon Selector")
  win.resizable(False, False)
  win.geometry(f"{window_width}x{window_height}")
  win.configure(bg="#F7F7F7")
  can = Canvas(win, width=window_width, height=window_height, bg="#F7F7F7", highlightthickness=0)
  can.place(x=0,y=0)
  
  label1 = Label(win, text="Here you can create different polygons\n!! HAVE FUN !!",
                 fg="#FFB26B", bg="#F7F7F7")
  label1.pack()
  
  # 绘制自定义按钮
  def on_button_click(event):
      print("按钮被点击")
  
  # 创建按钮矩形和文字
  button_rect = can.create_rectangle(150, 100, 350, 140, fill="#000000", outline="")
  button_text = can.create_text(250, 120, text="To the selection", fill="white")
  # 绑定点击事件
  can.tag_bind(button_rect, "<Button-1>", on_button_click)
  can.tag_bind(button_text, "<Button-1>", on_button_click)
  
  win.mainloop()
  

内容的提问来源于stack exchange，提问作者Enno