我在 tkinter 中的按钮没有显示图像 [英] my button in tkinter is not showing the image

问题描述

这段代码只是一个例子代码:

this code is just an example code:

import tkinter as tk
root = tk.Tk()
photoImageObj = tk.PhotoImage(file="signout.png")
lab = tk.Label(root, image=photoImageObj).pack()
photoImageObjj = tk.PhotoImage(file="signout.png")
signout_button=tk.Button(root,image=photoImageObjj).pack()
root.mainloop()

在这段代码中，它工作正常，输出也工作正常.这是输出:但在我的实际项目中，我使用带有图像的按钮不起作用.代码:

In this code it is working and output is also working fine. here is the output: but in my real project, where I am using this button with the image is not working. code:

photoImageObj = PhotoImage(file="signout.png")
signout_button=Button(stem,image=photoImageObj).pack()

这里我没有粘贴我的全部代码，因为它有 50-60 行代码.输出:

here I haven't pasted my whole code since it is having 50-60 line's of code. Output:

所以如果相同的代码工作正常，那么我的真实项目文件就有问题.谁能帮我调试一下.

so if the same code is working fine, then there is problem in my real project file. so can anyone help me debug that.

推荐答案

当一个图像在一个函数中时，你必须保持对图像的引用，否则它会被 python 垃圾收集.提供的代码很难说，但请尝试以下操作:

When an image is inside a function you have to keep reference to the image or it will be garbage collected by python. With the code provided its hard to say, but just try something like:

signout_button = Button(stem,image=photoImageObj)
signout_button.pack() #so that signout_button is not None
signout_button.image=photoImageObj #keeping a reference

或者，您也可以在函数之上说global photoImageObj，但不建议使用global.此问题应标记为重复并关闭，但以防万一您不明白在特定情况"中该做什么，这里是答案.

Alternatively, you could also say global photoImageObj on top of function, but its not recommended to use global. This question should be marked as a duplicate and closed, but just in-case you dont understand what to do in your "specific case", here is the answer.

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