如果在函数中创建Tkinter图像，为什么不显示？ [英] Why does Tkinter image not show up if created in a function?

问题描述

此代码有效：

import tkinter

root = tkinter.Tk()
canvas = tkinter.Canvas(root)
canvas.grid(row = 0, column = 0)
photo = tkinter.PhotoImage(file = './test.gif')
canvas.create_image(0, 0, image=photo)
root.mainloop()

它向我显示了图像。

现在，这段代码编译但它没有显示我的图像，我不知道为什么，因为它是相同的代码，在课堂上：

Now, this code compiles but it doesn't show me the image, and I don't know why, because it's the same code, in a class:

import tkinter

class Test:
    def __init__(self, master):
        canvas = tkinter.Canvas(master)
        canvas.grid(row = 0, column = 0)
        photo = tkinter.PhotoImage(file = './test.gif')
        canvas.create_image(0, 0, image=photo)

root = tkinter.Tk()
test = Test(root)
root.mainloop()

推荐答案

变量 photo 是一个局部变量在实例化类之后获取垃圾。保存对照片的引用，例如：

The variable photo is a local variable which gets garbage collected after the class is instantiated. Save a reference to the photo, for example:

self.photo = tkinter.PhotoImage(...)

如果您在tkinter图片无法显示上进行Google搜索，则第一个结果为：

If you do a Google search on "tkinter image doesn't display", the first result is this:

http ：//effbot.org/pyfaq/why-do-my-tkinter-images-not-appear.htm

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