在按钮上制作新标签时出现问题 tkinter

Question

   import tkinter as tkroot = tk.Tk()root.title("To Do")root.geometry("500x750")root.resizable(False, False)class App:    def __init__(self, window):        #Button font        self.buttonFont = ("Courier", 13, "normal")        #Header        self.header = tk.Label(text = "To Do List\n", font = ("Helvetica", 26, "bold"))        self.header.grid()        #Add item button        self.addButton = tk.Button(text = "Add Item", font = self.buttonFont, bg = "green", command = self.OpenAddItem)        self.addButton.grid(row = 1, column = 0, )        #Del item button        self.delButton = tk.Button(text = "Delete Item", font = self.buttonFont, bg = "red")        self.delButton.grid(row = 1, column = 1, )        #items frame and stuff        self.itemsframe = tk.Frame()        self.itemsframe.grid(row = 2)        self.item = tk.Label(self.itemsframe, font = ("Helvetica", 11, "normal"))    def OpenAddItem(self):        #COnfiguring prompt win        self.addPromptWin = tk.Toplevel(root)        self.addPromptWin.title("Prompt")        self.addPromptWin.geometry("375x100")        self.addPromptWin.resizable(False,False)        #Entry label        self.entryLabel = tk.Label(self.addPromptWin,text = "Enter item name:", font = ("Courier", 11, "normal"))        self.entryLabel.grid(sticky = tk.E)        #Adding entry         self.entry = tk.Entry(self.addPromptWin, font = ("Courier", 11, "normal"))        self.entry.grid(row = 0, column = 1)        self.entry.bind("<Return>", lambda e: self.AddItem())        #Add new item button        self.addNewItemButton = tk.Button(self.addPromptWin, text = "Add", font = self.buttonFont, bg = "green", command = self.AddItem)        self.addNewItemButton.grid(row = 1, sticky = tk.W)大家好，我的 tkinter gui 程序有问题。当我调用 addItem 函数时，它不是每次都创建一个新标签，而是替换当前标签。任何帮助将非常感激！

Answer 1

你创建了一个Label命名文件self.item，然后不断地覆盖它，期望它神奇地成为一个新的Label. 修复方法很简单~不要创建self.item. 相反，创建一个列表并Labels根据需要将新内容推送到其中。这为您的删除方法奠定了基础，因为您可以解压缩缓存中的所有内容，删除所需的项目并重新打包缓存中剩余的所有内容。我的例子在重要的地方进行了评论。我没有给你写删除方法。

import tkinter as tk

root = tk.Tk()

root.title("To Do")

root.geometry("500x750")

root.resizable(False, False)

class App:

    def __init__(self, window):

        #Button font

        self.buttonFont = ("Courier", 13, "normal")

        #Header

        self.header = tk.Label(text = "To Do List\n", font = ("Helvetica", 26, "bold"))

        self.header.grid()

        #Add item button

        self.addButton = tk.Button(text = "Add Item", font = self.buttonFont, bg = "green", command = self.OpenAddItem)

        self.addButton.grid(row = 1, column = 0, )

        #Del item button

        self.delButton = tk.Button(text = "Delete Item", font = self.buttonFont, bg = "red")

        self.delButton.grid(row = 1, column = 1, )

        #items frame and stuff

        self.itemsframe = tk.Frame()

        self.itemsframe.grid(row = 2)

        

        ''' you just keep overwriting this '''

        #self.item = tk.Label(self.itemsframe, font = ("Helvetica", 11, "normal"))

        

        #start a cache instead

        self.items = []

        

    def OpenAddItem(self):

        #COnfiguring prompt win

        self.addPromptWin = tk.Toplevel(root)

        self.addPromptWin.title("Prompt")

        self.addPromptWin.geometry("375x100")

        self.addPromptWin.resizable(False,False)

        #Entry label

        self.entryLabel = tk.Label(self.addPromptWin,text = "Enter item name:", font = ("Courier", 11, "normal"))

        self.entryLabel.grid(sticky = tk.E)

        #Adding entry 

        self.entry = tk.Entry(self.addPromptWin, font = ("Courier", 11, "normal"))

        self.entry.grid(row = 0, column = 1)

        self.entry.bind("<Return>", lambda e: self.AddItem())

        #Add new item button

        self.addNewItemButton = tk.Button(self.addPromptWin, text = "Add", font = self.buttonFont, bg = "green", command = self.AddItem)

        self.addNewItemButton.grid(row = 1, sticky = tk.W)

        

    def AddItem(self):

        self.entryValue = self.entry.get()

        

        '''

            you can keep configuring and repacking this for infinity

            it's not going to change the fact that it's the same label every time

        '''

        #self.item.config(text = f"1.  {self.entryValue}")

        #self.item.pack()

        

        #append a new label to the cache instead

        self.items.append(tk.Label(self.itemsframe, font = ("Helvetica", 11, "normal"), anchor='w'))

        

        #config and pack the last item in the cache

        self.items[-1].config(text = f"{len(self.items)}.  {self.entryValue}",)

        self.items[-1].pack(anchor='w')

        

        self.addPromptWin.destroy()

app = App(root) 

root.mainloop()