TKInter覆盖文本

Question

我在学KINTER我有点困惑。下面的代码显示了face_recogniton()函数中的白色文本。

import tkinter as tk
from PIL import Image, ImageTk
from facerec_on_raspberry_pi import face_function #face_function() return recognized person name

root = tk.Tk()

#Fullscreen
root.overrideredirect(True)
root.overrideredirect(False)
root.attributes('-fullscreen',True)
root.configure(background='black')

def my_mainloop():
    print (face_function())
    instructions = tk.Label(root, text=str(face_function()), font=('Raleway', 55), fg='white', bg='black')
    instructions.place(x=160, y=60)
    root.after(1, my_mainloop)

root.after(1, my_mainloop)

root.mainloop()

但文本重叠了。在显示新文本之前，如何清除它？

Answer 1

您不需要在每次需要更改文本时重新创建标签。创建后可以更改现有标签的文本。还要注意我评论的两行：你不需要两者。

import tkinter as tk
from PIL import Image, ImageTk
from facerec_on_raspberry_pi import face_function #face_function() return recognized person name

root = tk.Tk()

#Fullscreen
root.overrideredirect(True) # Use only one of this two lines: 
root.overrideredirect(False) # you just set a flag and then change it
root.attributes('-fullscreen',True)
root.configure(background='black')

instructions = tk.Label(root, text='', font=('Raleway', 55), fg='white', bg='black')
instructions.place(x=160, y=60)

def my_mainloop():
    print (face_function())
    instructions['text'] = str(face_function())    
    root.after(1, my_mainloop)

root.after(1, my_mainloop)

root.mainloop()