每当我运行我的程序时，以下 python tkinter 代码中的字体大小问题不会增加

如何解决每当我运行我的程序时，以下 python tkinter 代码中的字体大小问题不会增加

为什么字体大小没有增加，尽管我在下面的代码中明确提到了它，请有人检查告诉我问题。每当我我的代码并选择文本大小并单击一些数字时，例如 8 0r 9 或任何其他数字字体大小也应根据数字更改，如小数字字体大小应小，大数字字体大小应大但字体尺寸没有变化。

from tkinter import *
import tkinter.font as font

root = Tk()

root.title("MyCodeEditor")

def run():
    code = editor.get('1.0',END)
    exec(code)
############################ colour theme ######################################################3#
def dark():
    editor.config(background = "black",foreground = "white",insertbackground = "white")
    root.config(background = "black")
def light():
    editor.config(background = "white",foreground = "black",insertbackground = "black" )
    root.config(background = "white")
def blue_sky():
    editor.config(background = "powder blue",insertbackground = "black" )
    root.config(background = "powder blue")
####################################### Text style ####################################################33
def terminal_family():
    editor.config(font = 'Terminal')
def modern_family():
    editor.config(font = ('Modern'))
def roman_family():
    editor.config(font = 'Roman')
def default_family():
    editor.config(font = 'Calibri')
def system_family():
    editor.config(font = 'System')
def aerial_family():
    editor.config(font = 'Aerial')
def ms_serif_family ():
    editor.config(font = 'MS_Serif')

############################ Text size #################################################################################################

def eight_size():
    editor.config(font = 8)
def nine_size():
    editor.config(font = 9)
def ten_size():
    editor.config(font = 10)
def eleven_size():
    editor.config(font = 11)
def twelve_size():
    editor.config(font = 12)
def thirteen_size():
    editor.config(font = 13)
def fourteen_size():
    editor.config(font = 14)
def fifteen_size():
    editor.config(font = 15)
def sixteen_size():
    editor.config(font = 16)
def seventeen_size():
    editor.config(font = 17)
def eighteen_size():
    editor.config(font = 18)
def nineteen_size():
    editor.config(font = 19)
def twenty_size():
    editor.config(font = 20)
def twenty_five_size():
    editor.config(font = 25)
def thirty_size():
    editor.config(font = 30)

# menu_bar = Menu(root)
####################################### Menu ############################################################
menu_bar = Menu(root)

file_bar = Menu(menu_bar,tearoff = 0)
file_bar.add_command(label = 'Open',command = run )
file_bar.add_command(label = 'Save',command = run )
file_bar.add_command(label = 'Save as',command = run )
file_bar.add_command(label = 'Exit',command = exit )
menu_bar.add_cascade(label='File',menu = file_bar)
root.config(menu = menu_bar)
###########################################################################################################
run_bar = Menu(menu_bar,tearoff = 0)
run_bar.add_command(label = 'Run',command = run )
menu_bar.add_cascade(label='Run',menu = run_bar)
root.config(menu = menu_bar)
##############################################################################################################
colorTheme_bar = Menu(menu_bar,tearoff = 0)
colorTheme_bar.add_command(label = 'Light Mode',command = light )
colorTheme_bar.add_command(label = 'Dark Mode',command = dark )
colorTheme_bar.add_command(label = 'Blue Sky Mode',command = blue_sky )
menu_bar.add_cascade(label='Color Theme',menu = colorTheme_bar)
root.config(menu = menu_bar)
# file_bar = Menu(menu_bar,tearoff = 0)
# file_bar.add_command(label = 'Open',command = run )
# menu_bar.add_cascade(label='File',menu = file_bar)
# root.config(menu = menu_bar)
#####################################################################################################################
fontStyle_bar = Menu(menu_bar,tearoff = 0)
fontStyle_bar.add_command(label = 'Default',command = default_family)
fontStyle_bar.add_command(label = 'Modern',command = modern_family )
fontStyle_bar.add_command(label = 'Roman',command = roman_family )
fontStyle_bar.add_command(label = 'Ms serif',command = ms_serif_family )
fontStyle_bar.add_command(label = 'Aerial',command = aerial_family )
fontStyle_bar.add_command(label = 'System',command = system_family )
fontStyle_bar.add_command(label = 'Terminal',command = terminal_family )
menu_bar.add_cascade(label='Text Style',menu = fontStyle_bar)
root.config(menu = menu_bar)
######################################################################################################################################
textSize_bar = Menu(menu_bar,tearoff = 0)
textSize_bar.add_command(label = 8,command = eight_size )
textSize_bar.add_command(label = 9,command = nine_size )
textSize_bar.add_command(label = 10,command = ten_size )
textSize_bar.add_command(label = 11,command = eleven_size )
textSize_bar.add_command(label = 12,command = twelve_size )
textSize_bar.add_command(label = 13,command = thirteen_size )
textSize_bar.add_command(label = 14,command = fourteen_size )
textSize_bar.add_command(label = 15,command = fifteen_size )
textSize_bar.add_command(label = 16,command = sixteen_size )
textSize_bar.add_command(label = 17,command = seventeen_size )
textSize_bar.add_command(label = 18,command = eighteen_size )
textSize_bar.add_command(label = 19,command = nineteen_size )
textSize_bar.add_command(label = 20,command = twenty_size )
textSize_bar.add_command(label = 25,command = twenty_five_size )
textSize_bar.add_command(label = 30,command = thirty_size )
menu_bar.add_cascade(label='Text Size',menu = textSize_bar)
root.config(menu = menu_bar)
#########################################################################################################
editor = Text()
editor.pack()

root.mainloop()

解决方法

你的代码有一个致命的缺陷。每次修改字体时，都会为小部件提供一种全新的字体。例如，考虑以下两行：

editor.config(font = 'Terminal')
editor.config(font = 13)

每次调用其中一个语句时，您不仅仅是在更改一个属性，而是在配置一种全新的字体。当您调用 editor.config(font=13) 时，您是在告诉 tkinter 创建一个名为“13”的全新字体，它将使用 tkinter 的所有默认字体大小、系列等。

一旦您从需要单一字体变为可配置字体，每次您想更改属性时都创建新字体是错误的解决方案。相反，您应该使用字体对象。

当您使用字体对象并更改该字体对象的大小时，所有使用该字体的小部件都会自动更改。这是 tkinter 的一个非常强大但未被充分利用的功能。

让我们从一个小程序开始：

import tkinter as tk
from tkinter.font import Font

root = tk.Tk()
root.geometry("600x600")
textFont = Font(size=18)
text = tk.Text(root,font=textFont)
text.pack(fill="both",expand=True)

root.mainloop()

请注意，我们创建了一个名为 textFont 的自定义字体并将大小初始化为 18 磅。然后我们创建了一个使用这种字体的文本小部件。我们还可以以类似的方式设置任何其他参数（族、重量、倾斜、下划线、重叠），但为了简单起见，我将其省略了。

我们可以通过更改 textFont 对象来修改文本小部件使​​用的字体。例如，这里有一个函数可以使字体按我们想要的任意数量增大或缩小。调用时，每个使用相同 textFont 的小部件都会增大或缩小。

def change_font_size(delta):
    current_size = textFont.cget("size")
    new_size = int(current_size) + delta
    textFont.configure(size=new_size)

例如，要使字体大两点，您可以这样称呼它：

change_font_size(2)

让我们添加一个简单的“查看”菜单，让我们放大和缩小字体：

menubar = tk.Menu(root)
root.configure(menu=menubar)

viewMenu = tk.Menu(menubar)
menubar.add_cascade(label="View",menu=viewMenu)
viewMenu.add_command(label="Zoom In",command=lambda: change_font_size(2))
viewMenu.add_command(label="Zoom Out",command=lambda: change_font_size(-2))

现在，每当您选择“放大”或“缩小”时，都会调用该函数，更改字体，并且任何使用该字体的小部件都会自动更新。

您可以以类似的方式更改字体系列。它可能看起来像这样：

def change_font_family(family):
    textFont.configure(family=family)
...
fontFamilyMenu = tk.Menu(...)
for family in ("Terminal","Ariel",...):
    fontFamilyMenu.add_command(label=family,command=lambda family=family: change_font_family(family))

----

有关如何在不创建新字体的情况下修改 tkinter 的默认字体的信息，请参阅问题 this answer

的 Modify the default font in Python Tkinter ,

尝试这样的事情：

import tkinter as tk

def change_size(new_size):
    global font_size
    font_size = new_size
    label.config(font=(font_family,font_size))

def change_font(new_font):
    global font_family
    font_family = new_font
    label.config(font=(font_family,font_size))


font_family = ""
font_size = 10

root = tk.Tk()
label = tk.Label(root,text="This is the label.",font=(font_family,font_size))
label.pack()

for i in range(8,26):
    text = f"Change text's size to: {i}"
    button = tk.Button(root,text=text,command=lambda i=i: change_size(i))
    button.pack()

font_families_available = ("Terminal","Modern","Roman")

for font_family_name in font_families_available:
    text = f"Change text's font to: {font_family_name}"
    command = lambda font_family_name=font_family_name: change_font(font_family_name)
    button = tk.Button(root,command=command)
    button.pack()

root.mainloop()

它使用 2 个全局变量：font_family 和 font_size 作为字体并在按下任何按钮时更新字体

,

变化如下： 将所有选择字体大小的函数更新为此。如果你不想改变你的字体，你可以这样做：font=("",<size>)

def eight_size():
    editor.config(font = ("arial",8))
def nine_size():
    editor.config(font = ("arial",9))
def ten_size():
    editor.config(font = ("arial",10))
def eleven_size():
    editor.config(font = ("arial",11))
def twelve_size():
    editor.config(font = ("arial",12))
def thirteen_size():
    editor.config(font = ("arial",13))
def fourteen_size():
    editor.config(font = ("arial",14))
def fifteen_size():
    editor.config(font = ("arial",15))
def sixteen_size():
    editor.config(font = ("arial",16))
def seventeen_size():
    editor.config(font = ("arial",17))
def eighteen_size():
    editor.config(font = ("arial",18))
def nineteen_size():
    editor.config(font = ("arial",19))
def twenty_size():
    editor.config(font = ("arial",20))
def twenty_five_size():
    editor.config(font = ("arial",25))
def thirty_size():
    editor.config(font = ("arial",30))

替换选择字体的菜单：

textSize_bar = Menu(menu_bar,tearoff = 0)
textSize_bar.add_command(label = 8,command = eight_size )
textSize_bar.add_command(label = 9,command = nine_size )
textSize_bar.add_command(label = 10,command = ten_size )
textSize_bar.add_command(label = 11,command = eleven_size )
textSize_bar.add_command(label = 12,command = twelve_size )
textSize_bar.add_command(label = 13,command = thirteen_size )
textSize_bar.add_command(label = 14,command = fourteen_size )
textSize_bar.add_command(label = 15,command = fifteen_size )
textSize_bar.add_command(label = 16,command = sixteen_size )
textSize_bar.add_command(label = 17,command = seventeen_size )
textSize_bar.add_command(label = 18,command = eighteen_size )
textSize_bar.add_command(label = 19,command = nineteen_size )
textSize_bar.add_command(label = 20,command = twenty_size )
textSize_bar.add_command(label = 25,command = twenty_five_size )
textSize_bar.add_command(label = 30,command = thirty_size )
menu_bar.add_cascade(label='Text Size',menu = textSize_bar)
root.config(menu = menu_bar)