Python tkinter在函数内运行时无法运行

Question

Python tkinter在函数内运行时无法运行

3

def display_rain():
    rain_image = Image.open("./images/rain_jpeg.jpg")
    rain_resized = rain_image.resize((250,250), Image.ANTIALIAS)
    rain_tk = ImageTk.PhotoImage(rain_resized)
    rain_label = tk.Label(root, image = rain_tk)
    rain_label.grid(row = 0, column = 0)
    rain_label.pack()

display_rain()

代码在函数外部运行良好，但在函数内部似乎根本没有运行。我已经尝试重启 Python 并重新命名该函数。

- Benjamin McDowell

在函数的第一行添加“global root”，看看会发生什么。此外，选择pack或grid中的一个，不要同时使用两者。还要将图像与您想要加载的任何其他图像存储在全局字典中。按照您目前的方式，您的图像很可能被垃圾回收。 - OneMadGypsy

请问您能否更具体一些？当它工作时会发生什么（例如，您期望它做什么），而当它不工作时会发生什么？是否有任何错误信息？ - jthulhu

@MichaelGuidry 那不会有任何区别。 - user14248283

@AryanParekh - 我关于垃圾回收的编辑可能会有所帮助。 - OneMadGypsy

@MichaelGuidry 我不确定，因为在根中有对该标签的引用，所以垃圾收集器不应该将其删除... - jthulhu

1个回答

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- OneMadGypsy · Accepted Answer

您的图像正在进行垃圾回收。这是有效的。

import tkinter as tk
from PIL import Image, ImageTk


root = tk.Tk()
root.geometry("800x600")

#store all images in this dict so garbage collection will leave them alone
#it doesn't have to be named "images"; it just has to be a dict
images = dict()


def display_rain(row=0, column=0):
    #create and store the image if it doesn't exist
    if 'rain_tk' not in images:
        #unless you are making mips of this image you should probably  
        #~make it the proper size and get rid of the resize part
        image = Image.open("./images/rain_jpeg.jpg").resize((250,250), Image.ANTIALIAS)
        #you can add a name to reference the image by
        #this makes it cleaner than accessing the dict directly
        images['rain_tk'] = ImageTk.PhotoImage(image, name='rain')
        
    #make and return the label, in case you want to grid_forget it or change the image
    label = tk.Label(root, image='rain') #instead of image=images['rain_tk']
    label.grid(row=row, column=column)
    return label
    
#you can easily display this wherever you want by filling in the row and column arguments
#as an example, this would be displayed at row1 column2
rain_lbl = display_rain(1, 2)
      
root.mainloop()