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python - 如何使用相同的按钮从 Tkinter Canvas 生成和删除特定的文本标签？

问题描述

我刚开始学习 Tkinter。通过一个初学者项目，我遇到了这种情况，我必须使用相同的按钮来生成一个字符串并用一个新的替换它，因为新的与旧的重叠。这是代码段：

def ranQ():

    if root.count < len(root.LoQ):
        tx=canv.create_text(400, 50, text=root.LoQ[root.count], font=('Jokerman', 15), fill="Purple")
        root.count += 1

    else:
        # l2 = Label(root, text="End of 7 questions! Click to generate again!", fg= "white", bg ="red")
        # l2.pack()
        canv.create_text(400, 450, text="End of 7 questions! Click to generate again!", font=('Jokerman', 10), fill="Purple")
        root.count=0

        random.shuffle(root.LoQ)

# defining background image
im = PhotoImage(file="{path}")

# Creating a canvas

canv = Canvas(root, width =800, height=500)
canv.pack(fill ="both", expand= True)

# Putting the image in canvas

canv.create_image(0,0, image=im, anchor='nw')

# adding a text label

canv.create_text(400,450,text ="7 Random Questions!", font=('Jokerman',50), fill="black")
canv.create_text(404,454,text ="7 Random Questions!", font=('Jokerman',50), fill="purple")

# adding the generate button
btn_g = Button(root, text='Press to generate a random question'.upper(),font=('Jokerman',10), padx=60, pady=20, fg="white", bg='Red',
                  command=ranQ)
b_window = canv.create_window(220,225,anchor="nw", window= btn_g)

标签： pythontkintertkinter-canvas

解决方案

你有没有尝试过这样的事情？：

import tkinter as tk
from random import randint

def callback():
    new_text = randint(0, 100)
    # Reconfigure the text
    canvas.itemconfig(text_id, text=new_text)

root = tk.Tk()

canvas = tk.Canvas(root, width=200, height=200)
canvas.pack()

# Save the text id that the canvas gives us
text_id = canvas.create_text(100, 100, text="")

button = tk.Button(root, text="Click me", command=callback)
button.pack(fill="x")

root.mainloop()

基本上你重新配置文本。你可以在这里找到更多信息

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