即使在使用 pack() 之后 winfo_width() 也返回 1 [英] winfo_width() returns 1 even after using pack()

问题描述

我在网上搜索过，我也尝试过自己解决，但一直无法解决.即使在渲染小部件之后，winfo 函数也会返回错误的高度和宽度

I have searched online and I have tried solving it on my own but I have not been able to solve it. Even after rendering the widget the winfo functions are returning wrong height and width

from tkinter import *

root = Tk()

frame = Frame(root)

label1 = Label(frame, text = "hello")
label1.pack()

label2 = Label(frame, text = "hello")
label2.pack()

label3 = Label(frame, text = "hello")
label3.pack()

frame.pack()    
print(frame.winfo_width(),frame.winfo_height())

#prints "1 1"

root.mainloop()

推荐答案

您需要update_idletasks:

调用所有挂起的空闲任务，不处理任何其他事件.这可用于在必要时执行几何管理和重绘小部件，而无需调用任何回调.

Calls all pending idle tasks, without processing any other events. This can be used to carry out geometry management and redraw widgets if necessary, without calling any callbacks.

frame.pack()
root.update_idletasks() 
print(frame.winfo_width(), frame.winfo_height())

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