为什么Tkinter为我的按钮创建一个新窗口？

Question

我正在尝试将按钮添加到我的窗口中，但是它为该按钮创建了一个新窗口，如何将其添加到我有背景的同一窗口中？

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter import messagebox
from PIL import ImageTk

top = Tk()

C = Canvas(top, bg ="blue", height=1920, width=1080)
filename = ImageTk.PhotoImage(file = "C:/Users/plapl/Desktop/ching.jpg")
background_label = Label(top, image=filename)
background_label.place(x=0, y=0, relwidth=1, relheight=1)
C.pack()


root = Tk()

myButton = Button(root, text = "Add a task")
myButton.pack()

root.mainloop()

Answer 1

这是因为您为Tk（）创建了一个新实例。更改为：

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter import messagebox
from PIL import ImageTk

top = Tk()

C = Canvas(top, bg ="blue", height=1920, width=1080)
filename = ImageTk.PhotoImage(file = "C:/Users/plapl/Desktop/ching.jpg")
background_label = Label(top, image=filename)
background_label.place(x=0, y=0, relwidth=1, relheight=1)
C.pack()

myButton = Button(top, text = "Add a task")
myButton.pack()

root.mainloop()

Answer 2

这是因为您有2 Tk（）对象，这意味着将创建2个窗口。要解决此问题，请将行：background_label = Label(top, image=filename)更改为此：background_label = Label(root, image=filename)。

然后，您可以删除此行：top = Tk()，因为不再需要它。