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Python tkinter GUI动态改变图像

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发布： 2024-02-09 14:45:04

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Python tkinter GUI动态改变图像

问题内容

我来自java，只想创建一个带有图片的图形用户界面，但是图片正在动态变化，我不知道它将是哪张图片......但它不起作用，我只能创建一个图像并且无法在 root.mainloop() 之外更改它并收到大量错误消息... 有人知道如何动态更改图像吗？非常感谢

import tkinter as tk
from PIL import Image, ImageTk

def add_image_to_gui(root, image_path):
    # Load image
    image = Image.open(image_path)
    # Convert image to Tkinter-compatible format
    tk_image = ImageTk.PhotoImage(image)
    # Create label and display image
    image_label = tk.Label(root, image=tk_image)
    image_label.image = tk_image  # Keep reference to the image to prevent it from being garbage collected
    image_label.pack()

def create_gui(window_title, window_size, image_path):
    # Create Tkinter window
    root = tk.Tk()
    root.title(window_title)
    root.geometry(window_size)

    # Add image
    add_image_to_gui(root, image_path)

    # Start Tkinter event loop
    root.mainloop()

    return root

if __name__ == "__main__":
    window_title = "Simple GUI"
    window_size = "1495x1020"
    image_path = "Bilder/Hauptfenster.png"
    root = create_gui(window_title, window_size, image_path)

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chatgpt，谷歌搜索，但似乎没有人像我一样遇到同样的问题......

正确答案

为了在一段时间后切换图像，您需要调用某种类型的函数来更改它。由于此 gui 没有按钮，最简单的方法是使用 tkinter.tk().after 安排将来的更新，并让该函数更改标签图像。

下面是一些示例代码，展示了如何通过最少的修改来实现这一目标：

编辑：更新注释中的附加信息，另一个函数将提供文件路径，对 function_that_yields_new_image_paths 的调用将被替换。

import tkinter as tk
from PIL import Image, ImageTk

def add_image_to_gui(root):
    image_label = tk.Label(root)
    image_label.pack()
    return image_label

def update_image(root, image_label):
    image = Image.open(function_that_yields_new_image_paths())
    tk_image = ImageTk.PhotoImage(image)
    image_label.configure(image=tk_image)
    image_label.image = tk_image
    root.after(1000, update_image, root, image_label)

def function_that_yields_new_image_paths():
    import numpy
    image_path1 = "a.png"
    image_path2 = "b.png"
    return numpy.random.choice((image_path1, image_path2))

def create_gui(window_title, window_size):
    # Create Tkinter window
    root = tk.Tk()
    root.title(window_title)
    root.geometry(window_size)

    # Add image
    image_label = add_image_to_gui(root)
    root.after(1, update_image, root, image_label)
    # Start Tkinter event loop
    root.mainloop()

    return root

if __name__ == "__main__":
    window_title = "Simple GUI"
    window_size = "1495x1020"

    root = create_gui(window_title, window_size)

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