Question

我是Python的入门程序员。我正在使用Tkinter库来创建带有下拉菜单的窗口。在下拉菜单中选择该项时，我创建了一个用于显示国家标志的标签。但是出了点问题，什么也没发生。这是我的代码，我将非常感谢谁帮助我处理和修复它。

from tkinter import *

root = Tk()
root.geometry('500x450+450+150')
root.title('Python Program')

menu = Menu(root)
root.config(menu=menu)

def callFlag():
    photo = PhotoImage('image.png')
    flag = Label(root, text='teste', image=photo)
    flag.pack()

subMenu = Menu(menu, tearoff=0)
menu.add_cascade(label='Bandeiras', menu=subMenu)
subMenu.add_command(label='Mongólia', command=callFlag)
subMenu.add_command(label='Opção 2', command=callFlag)

subMenu2 = Menu(menu, tearoff=0)
menu.add_cascade(label='Menu 2', menu=subMenu2)
subMenu2.add_command(label='Opção 1', command=callFlag)
subMenu2.add_command(label='Opção 2', command=callFlag)
subMenu2.add_separator()
subMenu2.add_command(label='Exit', command=exit)

root.mainloop()

Answer 1

这对您有用吗？

from tkinter import *

root = Tk()
root.geometry('500x450+450+150')
root.title('Python Program')

menu = Menu(root)
root.config(menu=menu)

def callFlag():
    photo = PhotoImage(file='image.png')
    flag = Label(root, text='teste', image=photo)
    flag.image = photo
    flag.pack()


subMenu = Menu(menu, tearoff=0)
menu.add_cascade(label='Bandeiras', menu=subMenu)
subMenu.add_command(label='Mongólia', command=callFlag)
subMenu.add_command(label='Opção 2', command=callFlag)

subMenu2 = Menu(menu, tearoff=0)
menu.add_cascade(label='Menu 2', menu=subMenu2)
subMenu2.add_command(label='Opção 1', command=callFlag)
subMenu2.add_command(label='Opção 2', command=callFlag)
subMenu2.add_separator()
subMenu2.add_command(label='Exit', command=exit)

root.mainloop()

当函数退出时，通过保留对photo（flag.image = photo）的额外引用，似乎可以避免Python的垃圾回收。

或者，您可以定义图像和标志以及其他所有内容，并在pack()中传递标志的add_command函数：

from tkinter import *

root = Tk()
root.geometry('500x450+450+150')
root.title('Python Program')

menu = Menu(root)
root.config(menu=menu)

photo = PhotoImage(file='image.png')
flag = Label(root, text='teste', image=photo)

subMenu = Menu(menu, tearoff=0)
menu.add_cascade(label='Bandeiras', menu=subMenu)
subMenu.add_command(label='Mongólia', command=flag.pack)
subMenu.add_command(label='Opção 2', command=flag.pack)

subMenu2 = Menu(menu, tearoff=0)
menu.add_cascade(label='Menu 2', menu=subMenu2)
subMenu2.add_command(label='Opção 1', command=flag.pack)
subMenu2.add_command(label='Opção 2', command=flag.pack)
subMenu2.add_separator()
subMenu2.add_command(label='Exit', command=exit)

root.mainloop()

在Label上调用图像到apper-Tkinter-Python

1 个答案: