Custom Tkinter使用pack_forget后出现重复添加按钮问题求助

问题出在你每次调用loadSelectionFrame时，只是通过pack_forget隐藏了selectionFrame，但Frame内部的旧控件（包括之前的加号按钮）并没有被移除。当你再次调用loadSelectionFrame时，会在同一个Frame里新增一套标签、组合框和按钮，旧的按钮仍然存在，因此会出现两个加号按钮。

方法一：清空Frame后再加载新控件 #

在loadSelectionFrame函数开头，先遍历selectionFrame的所有子控件并销毁它们，确保每次加载都是全新的控件：

修改后的完整代码：

import customtkinter
import tkinter

customtkinter.set_appearance_mode('dark')
customtkinter.set_default_color_theme('dark-blue') #dark-blue, blue, or green


def loadSelectionFrame(buttonCount=1):
    # 先清空selectionFrame内的所有旧控件
    for widget in selectionFrame.winfo_children():
        widget.destroy()
    
    selectionFrame.rowconfigure(buttonCount+2, weight=1)
    selectionFrame.columnconfigure(2, weight=1)
    selectionFrame.pack()

    fieldLabel = customtkinter.CTkLabel(master=selectionFrame, text="Choose Field")
    fieldLabel.grid(row=1, column=1, pady=12, padx=10)
    typeLabel = customtkinter.CTkLabel(master=selectionFrame, text="Choose Value")
    typeLabel.grid(row=1, column=2, pady=12, padx=10)
    for i in range(buttonCount):
        fieldsDropDown = customtkinter.CTkComboBox(master=selectionFrame, values=["Option 1", "Option 2"])
        fieldsDropDown.grid(row=i+2, column=1, pady=12, padx=10)
        typeDropDown = customtkinter.CTkComboBox(master=selectionFrame, values=["Option 1", "Option 2"])
        typeDropDown.grid(row=i+2, column=2, pady=12, padx=10)
    addMoreFieldsButton = customtkinter.CTkButton(master=selectionFrame, text="+", command=lambda: addMoreFields(buttonCount+1, selectionFrame))
    addMoreFieldsButton.grid(row=buttonCount+2, columnspan=3, pady=12, padx=10)

def addMoreFields(buttonCount, selectionFrame):
    selectionFrame.pack_forget()
    loadSelectionFrame(buttonCount)
    
root = customtkinter.CTk()
mainFrame = customtkinter.CTkFrame(master=root)
mainFrame.pack(pady=20,padx=60, fill='both', expand=True)
selectionFrame = customtkinter.CTkFrame(master=mainFrame)

loadSelectionFrame()

root.mainloop()

方法二：直接新增组合框（更高效） #

不需要每次销毁重建所有控件，只需要在点击按钮时新增一行组合框，并调整按钮的位置：

修改后的代码：

import customtkinter
import tkinter

customtkinter.set_appearance_mode('dark')
customtkinter.set_default_color_theme('dark-blue') #dark-blue, blue, or green

current_row = 2  # 记录当前要新增组合框的行号
add_button = None  # 保存加号按钮的引用

def loadSelectionFrame():
    global current_row, add_button
    selectionFrame.rowconfigure(0, weight=1)
    selectionFrame.columnconfigure(2, weight=1)
    selectionFrame.pack()

    fieldLabel = customtkinter.CTkLabel(master=selectionFrame, text="Choose Field")
    fieldLabel.grid(row=1, column=1, pady=12, padx=10)
    typeLabel = customtkinter.CTkLabel(master=selectionFrame, text="Choose Value")
    typeLabel.grid(row=1, column=2, pady=12, padx=10)
    
    # 初始化第一行组合框
    fieldsDropDown = customtkinter.CTkComboBox(master=selectionFrame, values=["Option 1", "Option 2"])
    fieldsDropDown.grid(row=current_row, column=1, pady=12, padx=10)
    typeDropDown = customtkinter.CTkComboBox(master=selectionFrame, values=["Option 1", "Option 2"])
    typeDropDown.grid(row=current_row, column=2, pady=12, padx=10)
    current_row +=1
    
    # 创建加号按钮
    add_button = customtkinter.CTkButton(master=selectionFrame, text="+", command=addMoreFields)
    add_button.grid(row=current_row, columnspan=3, pady=12, padx=10)

def addMoreFields():
    global current_row, add_button
    # 新增一行组合框
    fieldsDropDown = customtkinter.CTkComboBox(master=selectionFrame, values=["Option 1", "Option 2"])
    fieldsDropDown.grid(row=current_row, column=1, pady=12, padx=10)
    typeDropDown = customtkinter.CTkComboBox(master=selectionFrame, values=["Option 1", "Option 2"])
    typeDropDown.grid(row=current_row, column=2, pady=12, padx=10)
    current_row +=1
    # 调整加号按钮的位置到新的行
    add_button.grid(row=current_row, columnspan=3, pady=12, padx=10)
    
root = customtkinter.CTk()
mainFrame = customtkinter.CTkFrame(master=root)
mainFrame.pack(pady=20,padx=60, fill='both', expand=True)
selectionFrame = customtkinter.CTkFrame(master=mainFrame)

loadSelectionFrame()

root.mainloop()

说明 #

• 方法一通过widget.destroy()彻底删除旧控件，确保每次加载都是全新的内容，适合简单场景。
• 方法二更高效，只新增需要的控件，避免重复创建标签和销毁控件，适合频繁添加的场景。

内容的提问来源于stack exchange，提问作者Dorian