类中未显示 tkinter 画布图像 [英] tkinter canvas image is not displayed in class

问题描述

我正在尝试使用 tkinter 画布选项在 python 中显示图像.但是，如果我在类中输入它，如下所示，它不会给出错误，也不会显示我的图像.虽然按钮显示正确.另外，如果我从类中取出用于生成此图像的代码，它可以正常工作.我似乎无法找出问题所在.

I am trying to display an image in python using the tkinter canvas option. However, if I input it in a class, like below, it doesn't give an error but also doesn't show my image. The buttons are displayed correctly though. Also, if I take the code for generating this image out of the class it works correctly. I can't seem to find out what the problem is.

import Tkinter as tk
from Tkinter import *

class Board(tk.Frame):
    def __init__(self,parent):

        frame = Frame(parent)
        frame.pack()
        tk.Frame.__init__(self,parent)

        frame2 = Frame(frame)
        frame2.pack()

        c=Canvas(frame2)
        c.pack(expand=YES,fill=BOTH)
        background=PhotoImage(file='Board.gif')
        c.create_image(100,100,image=background,anchor='nw')

        button = Button(frame, text="Next turn", command=self.next_turn)
        button.pack()

        button = Button(frame, text="Roll the dice", command=self.roll)
        button.pack()

        ....

root = Tk()
board = Board(root)
board.pack()
root.mainloop()

推荐答案

您必须保留对 PhotoImage 的引用.这只是一个例子(你也可以使用 self.background 而不是 c.background):

You have to keep a reference to the PhotoImage. This is just and example (you can also use self.background instead of c.background):

    c = Canvas(frame2)
    c.pack(expand=YES,fill=BOTH)
    c.background = PhotoImage(file='Board.gif')
    c.create_image(100,100,image=c.background,anchor='nw')

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